diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index 9c29ed056..36d356493 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -8,17 +8,17 @@ on:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
-      - uses: pre-commit/action@v2.0.0
+      - uses: pre-commit/action@v3.0.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index e8375291d..c2975a418 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ There is a live example API for testing purposes, [available here][sandbox].
 # Requirements
 
 * Python 3.6+
-* Django 4.1, 4.0, 3.2, 3.1, 3.0
+* Django 4.2, 4.1, 4.0, 3.2, 3.1, 3.0
 
 We **highly recommend** and only officially support the latest patch release of
 each Python and Django series.
diff --git a/docs/api-guide/permissions.md b/docs/api-guide/permissions.md
index 27f7c5adb..5e0b6a153 100644
--- a/docs/api-guide/permissions.md
+++ b/docs/api-guide/permissions.md
@@ -165,7 +165,7 @@ This permission is suitable if you want your API to only be accessible to a subs
 
 ## IsAuthenticatedOrReadOnly
 
-The `IsAuthenticatedOrReadOnly` will allow authenticated users to perform any request.  Requests for unauthorised users will only be permitted if the request method is one of the "safe" methods; `GET`, `HEAD` or `OPTIONS`.
+The `IsAuthenticatedOrReadOnly` will allow authenticated users to perform any request.  Requests for unauthenticated users will only be permitted if the request method is one of the "safe" methods; `GET`, `HEAD` or `OPTIONS`.
 
 This permission is suitable if you want to your API to allow read permissions to anonymous users, and only allow write permissions to authenticated users.
 
diff --git a/docs/api-guide/reverse.md b/docs/api-guide/reverse.md
index 82dd16881..c3fa52f21 100644
--- a/docs/api-guide/reverse.md
+++ b/docs/api-guide/reverse.md
@@ -54,5 +54,5 @@ As with the `reverse` function, you should **include the request as a keyword ar
     api_root = reverse_lazy('api-root', request=request)
 
 [cite]: https://www.ics.uci.edu/~fielding/pubs/dissertation/rest_arch_style.htm#sec_5_1_5
-[reverse]: https://docs.djangoproject.com/en/stable/topics/http/urls/#reverse
-[reverse-lazy]: https://docs.djangoproject.com/en/stable/topics/http/urls/#reverse-lazy
+[reverse]: https://docs.djangoproject.com/en/stable/ref/urlresolvers/#reverse
+[reverse-lazy]: https://docs.djangoproject.com/en/stable/ref/urlresolvers/#reverse-lazy
diff --git a/docs/api-guide/validators.md b/docs/api-guide/validators.md
index bb8466a2c..2a1e3e6b3 100644
--- a/docs/api-guide/validators.md
+++ b/docs/api-guide/validators.md
@@ -53,7 +53,7 @@ If we open up the Django shell using `manage.py shell` we can now
 
 The interesting bit here is the `reference` field. We can see that the uniqueness constraint is being explicitly enforced by a validator on the serializer field.
 
-Because of this more explicit style REST framework includes a few validator classes that are not available in core Django. These classes are detailed below.
+Because of this more explicit style REST framework includes a few validator classes that are not available in core Django. These classes are detailed below.  REST framework validators, like their Django counterparts, implement the `__eq__` method, allowing you to compare instances for equality.
 
 ---
 
@@ -295,13 +295,14 @@ To write a class-based validator, use the `__call__` method. Class-based validat
 
 In some advanced cases you might want a validator to be passed the serializer
 field it is being used with as additional context. You can do so by setting
-a `requires_context = True` attribute on the validator. The `__call__` method
+a `requires_context = True` attribute on the validator class. The `__call__` method
 will then be called with the `serializer_field`
 or `serializer` as an additional argument.
 
-    requires_context = True
+    class MultipleOf:
+        requires_context = True
 
-    def __call__(self, value, serializer_field):
-        ...
+        def __call__(self, value, serializer_field):
+            ...
 
 [cite]: https://docs.djangoproject.com/en/stable/ref/validators/
diff --git a/docs/community/3.12-announcement.md b/docs/community/3.12-announcement.md
index 4a589e39c..3bfeb6576 100644
--- a/docs/community/3.12-announcement.md
+++ b/docs/community/3.12-announcement.md
@@ -143,6 +143,16 @@ class PublisherSearchView(generics.ListAPIView):
 
 ---
 
+## Deprecations
+
+### `serializers.NullBooleanField`
+
+`serializers.NullBooleanField` is now pending deprecation, and will be removed in 3.14.
+
+Instead use `serializers.BooleanField` field and set `allow_null=True` which does the same thing.
+
+---
+
 ## Funding
 
 REST framework is a *collaboratively funded project*. If you use
diff --git a/docs/community/3.14-announcement.md b/docs/community/3.14-announcement.md
index 0543d0d6d..e7b10ede1 100644
--- a/docs/community/3.14-announcement.md
+++ b/docs/community/3.14-announcement.md
@@ -60,3 +60,13 @@ See Pull Request [#7522](https://github.com/encode/django-rest-framework/pull/75
 ## Minor fixes and improvements
 
 There are a number of minor fixes and improvements in this release. See the [release notes](release-notes.md) page for a complete listing.
+
+---
+
+## Deprecations
+
+### `serializers.NullBooleanField`
+
+`serializers.NullBooleanField` was moved to pending deprecation in 3.12, and deprecated in 3.13. It has now been removed from the core framework.
+
+Instead use `serializers.BooleanField` field and set `allow_null=True` which does the same thing.
diff --git a/docs/community/release-notes.md b/docs/community/release-notes.md
index 887cae3b4..fba7f63d6 100644
--- a/docs/community/release-notes.md
+++ b/docs/community/release-notes.md
@@ -157,6 +157,7 @@ Date: 28th September 2020
 * Fix `PrimaryKeyRelatedField` and `HyperlinkedRelatedField` when source field is actually a property. [#7142]
 * `Token.generate_key` is now a class method. [#7502]
 * `@action` warns if method is wrapped in a decorator that does not preserve information using `@functools.wraps`. [#7098]
+* Deprecate `serializers.NullBooleanField` in favour of `serializers.BooleanField` with `allow_null=True` [#7122]
 
 ---
 
diff --git a/docs/index.md b/docs/index.md
index cab5511ac..ad241c0a3 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -86,7 +86,7 @@ continued development by **[signing up for a paid plan][funding]**.
 REST framework requires the following:
 
 * Python (3.6, 3.7, 3.8, 3.9, 3.10, 3.11)
-* Django (2.2, 3.0, 3.1, 3.2, 4.0, 4.1)
+* Django (3.0, 3.1, 3.2, 4.0, 4.1)
 
 We **highly recommend** and only officially support the latest patch release of
 each Python and Django series.
diff --git a/requirements/requirements-packaging.txt b/requirements/requirements-packaging.txt
index a9733185b..81f22a35a 100644
--- a/requirements/requirements-packaging.txt
+++ b/requirements/requirements-packaging.txt
@@ -1,8 +1,8 @@
 # Wheel for PyPI installs.
-wheel>=0.35.1,<0.36
+wheel>=0.36.2,<0.40.0
 
 # Twine for secured PyPI uploads.
-twine>=3.2.0,<3.3
+twine>=3.4.2,<4.0.2
 
 # Transifex client for managing translation resources.
 transifex-client
diff --git a/rest_framework/__init__.py b/rest_framework/__init__.py
index cc24ce46c..b9e3f9817 100644
--- a/rest_framework/__init__.py
+++ b/rest_framework/__init__.py
@@ -13,7 +13,7 @@ __title__ = 'Django REST framework'
 __version__ = '3.14.0'
 __author__ = 'Tom Christie'
 __license__ = 'BSD 3-Clause'
-__copyright__ = 'Copyright 2011-2019 Encode OSS Ltd'
+__copyright__ = 'Copyright 2011-2023 Encode OSS Ltd'
 
 # Version synonym
 VERSION = __version__
@@ -31,3 +31,7 @@ if django.VERSION < (3, 2):
 
 class RemovedInDRF315Warning(DeprecationWarning):
     pass
+
+
+class RemovedInDRF317Warning(PendingDeprecationWarning):
+    pass
diff --git a/rest_framework/authtoken/admin.py b/rest_framework/authtoken/admin.py
index e41eb0002..163328eb0 100644
--- a/rest_framework/authtoken/admin.py
+++ b/rest_framework/authtoken/admin.py
@@ -4,6 +4,7 @@ from django.contrib.admin.views.main import ChangeList
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ValidationError
 from django.urls import reverse
+from django.utils.translation import gettext_lazy as _
 
 from rest_framework.authtoken.models import Token, TokenProxy
 
@@ -23,6 +24,8 @@ class TokenChangeList(ChangeList):
 class TokenAdmin(admin.ModelAdmin):
     list_display = ('key', 'user', 'created')
     fields = ('user',)
+    search_fields = ('user__username',)
+    search_help_text = _('Username')
     ordering = ('-created',)
     actions = None  # Actions not compatible with mapped IDs.
     autocomplete_fields = ("user",)
diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 613bd325a..4ce9c79c3 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -4,9 +4,9 @@ import datetime
 import decimal
 import functools
 import inspect
+import logging
 import re
 import uuid
-from collections import OrderedDict
 from collections.abc import Mapping
 
 from django.conf import settings
@@ -17,6 +17,7 @@ from django.core.validators import (
     MinValueValidator, ProhibitNullCharactersValidator, RegexValidator,
     URLValidator, ip_address_validators
 )
+from django.db.models import IntegerChoices, TextChoices
 from django.forms import FilePathField as DjangoFilePathField
 from django.forms import ImageField as DjangoImageField
 from django.utils import timezone
@@ -28,15 +29,22 @@ from django.utils.encoding import is_protected_type, smart_str
 from django.utils.formats import localize_input, sanitize_separators
 from django.utils.ipv6 import clean_ipv6_address
 from django.utils.translation import gettext_lazy as _
-from pytz.exceptions import InvalidTimeError
+
+try:
+    import pytz
+except ImportError:
+    pytz = None
 
 from rest_framework import ISO_8601
 from rest_framework.exceptions import ErrorDetail, ValidationError
 from rest_framework.settings import api_settings
 from rest_framework.utils import html, humanize_datetime, json, representation
 from rest_framework.utils.formatting import lazy_format
+from rest_framework.utils.timezone import valid_datetime
 from rest_framework.validators import ProhibitSurrogateCharactersValidator
 
+logger = logging.getLogger("rest_framework.fields")
+
 
 class empty:
     """
@@ -109,27 +117,6 @@ def get_attribute(instance, attrs):
     return instance
 
 
-def set_value(dictionary, keys, value):
-    """
-    Similar to Python's built in `dictionary[key] = value`,
-    but takes a list of nested keys instead of a single key.
-
-    set_value({'a': 1}, [], {'b': 2}) -> {'a': 1, 'b': 2}
-    set_value({'a': 1}, ['x'], 2) -> {'a': 1, 'x': 2}
-    set_value({'a': 1}, ['x', 'y'], 2) -> {'a': 1, 'x': {'y': 2}}
-    """
-    if not keys:
-        dictionary.update(value)
-        return
-
-    for key in keys[:-1]:
-        if key not in dictionary:
-            dictionary[key] = {}
-        dictionary = dictionary[key]
-
-    dictionary[keys[-1]] = value
-
-
 def to_choices_dict(choices):
     """
     Convert choices into key/value dicts.
@@ -142,7 +129,7 @@ def to_choices_dict(choices):
     # choices = [1, 2, 3]
     # choices = [(1, 'First'), (2, 'Second'), (3, 'Third')]
     # choices = [('Category', ((1, 'First'), (2, 'Second'))), (3, 'Third')]
-    ret = OrderedDict()
+    ret = {}
     for choice in choices:
         if not isinstance(choice, (list, tuple)):
             # single choice
@@ -165,7 +152,7 @@ def flatten_choices_dict(choices):
     flatten_choices_dict({1: '1st', 2: '2nd'}) -> {1: '1st', 2: '2nd'}
     flatten_choices_dict({'Group': {1: '1st', 2: '2nd'}}) -> {1: '1st', 2: '2nd'}
     """
-    ret = OrderedDict()
+    ret = {}
     for key, value in choices.items():
         if isinstance(value, dict):
             # grouped choices (category, sub choices)
@@ -677,22 +664,27 @@ class BooleanField(Field):
     default_empty_html = False
     initial = False
     TRUE_VALUES = {
-        't', 'T',
-        'y', 'Y', 'yes', 'Yes', 'YES',
-        'true', 'True', 'TRUE',
-        'on', 'On', 'ON',
-        '1', 1,
-        True
+        't',
+        'y',
+        'yes',
+        'true',
+        'on',
+        '1',
+        1,
+        True,
     }
     FALSE_VALUES = {
-        'f', 'F',
-        'n', 'N', 'no', 'No', 'NO',
-        'false', 'False', 'FALSE',
-        'off', 'Off', 'OFF',
-        '0', 0, 0.0,
-        False
+        'f',
+        'n',
+        'no',
+        'false',
+        'off',
+        '0',
+        0,
+        0.0,
+        False,
     }
-    NULL_VALUES = {'null', 'Null', 'NULL', '', None}
+    NULL_VALUES = {'null', '', None}
 
     def __init__(self, **kwargs):
         if kwargs.get('allow_null', False):
@@ -700,22 +692,28 @@ class BooleanField(Field):
             self.initial = None
         super().__init__(**kwargs)
 
+    @staticmethod
+    def _lower_if_str(value):
+        if isinstance(value, str):
+            return value.lower()
+        return value
+
     def to_internal_value(self, data):
         with contextlib.suppress(TypeError):
-            if data in self.TRUE_VALUES:
+            if self._lower_if_str(data) in self.TRUE_VALUES:
                 return True
-            elif data in self.FALSE_VALUES:
+            elif self._lower_if_str(data) in self.FALSE_VALUES:
                 return False
-            elif data in self.NULL_VALUES and self.allow_null:
+            elif self._lower_if_str(data) in self.NULL_VALUES and self.allow_null:
                 return None
-        self.fail('invalid', input=data)
+        self.fail("invalid", input=data)
 
     def to_representation(self, value):
-        if value in self.TRUE_VALUES:
+        if self._lower_if_str(value) in self.TRUE_VALUES:
             return True
-        elif value in self.FALSE_VALUES:
+        elif self._lower_if_str(value) in self.FALSE_VALUES:
             return False
-        if value in self.NULL_VALUES and self.allow_null:
+        if self._lower_if_str(value) in self.NULL_VALUES and self.allow_null:
             return None
         return bool(value)
 
@@ -989,6 +987,11 @@ class DecimalField(Field):
         self.max_value = max_value
         self.min_value = min_value
 
+        if self.max_value is not None and not isinstance(self.max_value, decimal.Decimal):
+            logger.warning("max_value in DecimalField should be Decimal type.")
+        if self.min_value is not None and not isinstance(self.min_value, decimal.Decimal):
+            logger.warning("min_value in DecimalField should be Decimal type.")
+
         if self.max_digits is not None and self.decimal_places is not None:
             self.max_whole_digits = self.max_digits - self.decimal_places
         else:
@@ -1154,9 +1157,16 @@ class DateTimeField(Field):
                 except OverflowError:
                     self.fail('overflow')
             try:
-                return timezone.make_aware(value, field_timezone)
-            except InvalidTimeError:
-                self.fail('make_aware', timezone=field_timezone)
+                dt = timezone.make_aware(value, field_timezone)
+                # When the resulting datetime is a ZoneInfo instance, it won't necessarily
+                # throw given an invalid datetime, so we need to specifically check.
+                if not valid_datetime(dt):
+                    self.fail('make_aware', timezone=field_timezone)
+                return dt
+            except Exception as e:
+                if pytz and isinstance(e, pytz.exceptions.InvalidTimeError):
+                    self.fail('make_aware', timezone=field_timezone)
+                raise e
         elif (field_timezone is None) and timezone.is_aware(value):
             return timezone.make_naive(value, datetime.timezone.utc)
         return value
@@ -1392,6 +1402,10 @@ class ChoiceField(Field):
         if data == '' and self.allow_blank:
             return ''
 
+        if isinstance(data, (IntegerChoices, TextChoices)) and str(data) != \
+                str(data.value):
+            data = data.value
+
         try:
             return self.choice_strings_to_values[str(data)]
         except KeyError:
@@ -1400,6 +1414,11 @@ class ChoiceField(Field):
     def to_representation(self, value):
         if value in ('', None):
             return value
+
+        if isinstance(value, (IntegerChoices, TextChoices)) and str(value) != \
+                str(value.value):
+            value = value.value
+
         return self.choice_strings_to_values.get(str(value), value)
 
     def iter_options(self):
@@ -1423,7 +1442,8 @@ class ChoiceField(Field):
         # Allows us to deal with eg. integer choices while supporting either
         # integer or string input, but still get the correct datatype out.
         self.choice_strings_to_values = {
-            str(key): key for key in self.choices
+            str(key.value) if isinstance(key, (IntegerChoices, TextChoices))
+            and str(key) != str(key.value) else str(key): key for key in self.choices
         }
 
     choices = property(_get_choices, _set_choices)
@@ -1643,7 +1663,7 @@ class ListField(Field):
 
     def run_child_validation(self, data):
         result = []
-        errors = OrderedDict()
+        errors = {}
 
         for idx, item in enumerate(data):
             try:
@@ -1707,7 +1727,7 @@ class DictField(Field):
 
     def run_child_validation(self, data):
         result = {}
-        errors = OrderedDict()
+        errors = {}
 
         for key, value in data.items():
             key = str(key)
diff --git a/rest_framework/filters.py b/rest_framework/filters.py
index 1ffd9edc0..17e6975eb 100644
--- a/rest_framework/filters.py
+++ b/rest_framework/filters.py
@@ -3,6 +3,7 @@ Provides generic filtering backends that can be used to filter the results
 returned by list views.
 """
 import operator
+import warnings
 from functools import reduce
 
 from django.core.exceptions import ImproperlyConfigured
@@ -12,6 +13,7 @@ from django.template import loader
 from django.utils.encoding import force_str
 from django.utils.translation import gettext_lazy as _
 
+from rest_framework import RemovedInDRF317Warning
 from rest_framework.compat import coreapi, coreschema, distinct
 from rest_framework.settings import api_settings
 
@@ -29,6 +31,8 @@ class BaseFilterBackend:
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         return []
 
@@ -146,6 +150,8 @@ class SearchFilter(BaseFilterBackend):
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         return [
             coreapi.Field(
@@ -306,6 +312,8 @@ class OrderingFilter(BaseFilterBackend):
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         return [
             coreapi.Field(
diff --git a/rest_framework/metadata.py b/rest_framework/metadata.py
index 015587897..364ca5b14 100644
--- a/rest_framework/metadata.py
+++ b/rest_framework/metadata.py
@@ -6,8 +6,6 @@ some fairly ad-hoc information about the view.
 Future implementations might use JSON schema or other definitions in order
 to return this information in a more standardized way.
 """
-from collections import OrderedDict
-
 from django.core.exceptions import PermissionDenied
 from django.http import Http404
 from django.utils.encoding import force_str
@@ -59,11 +57,12 @@ class SimpleMetadata(BaseMetadata):
     })
 
     def determine_metadata(self, request, view):
-        metadata = OrderedDict()
-        metadata['name'] = view.get_view_name()
-        metadata['description'] = view.get_view_description()
-        metadata['renders'] = [renderer.media_type for renderer in view.renderer_classes]
-        metadata['parses'] = [parser.media_type for parser in view.parser_classes]
+        metadata = {
+            "name": view.get_view_name(),
+            "description": view.get_view_description(),
+            "renders": [renderer.media_type for renderer in view.renderer_classes],
+            "parses": [parser.media_type for parser in view.parser_classes],
+        }
         if hasattr(view, 'get_serializer'):
             actions = self.determine_actions(request, view)
             if actions:
@@ -106,25 +105,27 @@ class SimpleMetadata(BaseMetadata):
             # If this is a `ListSerializer` then we want to examine the
             # underlying child serializer instance instead.
             serializer = serializer.child
-        return OrderedDict([
-            (field_name, self.get_field_info(field))
+        return {
+            field_name: self.get_field_info(field)
             for field_name, field in serializer.fields.items()
             if not isinstance(field, serializers.HiddenField)
-        ])
+        }
 
     def get_field_info(self, field):
         """
         Given an instance of a serializer field, return a dictionary
         of metadata about it.
         """
-        field_info = OrderedDict()
-        field_info['type'] = self.label_lookup[field]
-        field_info['required'] = getattr(field, 'required', False)
+        field_info = {
+            "type": self.label_lookup[field],
+            "required": getattr(field, "required", False),
+        }
 
         attrs = [
             'read_only', 'label', 'help_text',
             'min_length', 'max_length',
-            'min_value', 'max_value'
+            'min_value', 'max_value',
+            'max_digits', 'decimal_places'
         ]
 
         for attr in attrs:
diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index f5c5b913b..7303890b0 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -4,16 +4,19 @@ be used for paginated responses.
 """
 
 import contextlib
+import warnings
 from base64 import b64decode, b64encode
-from collections import OrderedDict, namedtuple
+from collections import namedtuple
 from urllib import parse
 
 from django.core.paginator import InvalidPage
 from django.core.paginator import Paginator as DjangoPaginator
+from django.db.models import Q
 from django.template import loader
 from django.utils.encoding import force_str
 from django.utils.translation import gettext_lazy as _
 
+from rest_framework import RemovedInDRF317Warning
 from rest_framework.compat import coreapi, coreschema
 from rest_framework.exceptions import NotFound
 from rest_framework.response import Response
@@ -151,6 +154,8 @@ class BasePagination:
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         return []
 
     def get_schema_operation_parameters(self, view):
@@ -224,12 +229,12 @@ class PageNumberPagination(BasePagination):
         return page_number
 
     def get_paginated_response(self, data):
-        return Response(OrderedDict([
-            ('count', self.page.paginator.count),
-            ('next', self.get_next_link()),
-            ('previous', self.get_previous_link()),
-            ('results', data)
-        ]))
+        return Response({
+            'count': self.page.paginator.count,
+            'next': self.get_next_link(),
+            'previous': self.get_previous_link(),
+            'results': data,
+        })
 
     def get_paginated_response_schema(self, schema):
         return {
@@ -310,6 +315,8 @@ class PageNumberPagination(BasePagination):
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         fields = [
             coreapi.Field(
@@ -394,12 +401,12 @@ class LimitOffsetPagination(BasePagination):
         return list(queryset[self.offset:self.offset + self.limit])
 
     def get_paginated_response(self, data):
-        return Response(OrderedDict([
-            ('count', self.count),
-            ('next', self.get_next_link()),
-            ('previous', self.get_previous_link()),
-            ('results', data)
-        ]))
+        return Response({
+            'count': self.count,
+            'next': self.get_next_link(),
+            'previous': self.get_previous_link(),
+            'results': data
+        })
 
     def get_paginated_response_schema(self, schema):
         return {
@@ -524,6 +531,8 @@ class LimitOffsetPagination(BasePagination):
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         return [
             coreapi.Field(
@@ -620,7 +629,7 @@ class CursorPagination(BasePagination):
             queryset = queryset.order_by(*self.ordering)
 
         # If we have a cursor with a fixed position then filter by that.
-        if current_position is not None:
+        if str(current_position) != 'None':
             order = self.ordering[0]
             is_reversed = order.startswith('-')
             order_attr = order.lstrip('-')
@@ -631,7 +640,12 @@ class CursorPagination(BasePagination):
             else:
                 kwargs = {order_attr + '__gt': current_position}
 
-            queryset = queryset.filter(**kwargs)
+            filter_query = Q(**kwargs)
+            # If some records contain a null for the ordering field, don't lose them.
+            # When reverse ordering, nulls will come last and need to be included.
+            if (reverse and not is_reversed) or is_reversed:
+                filter_query |= Q(**{order_attr + '__isnull': True})
+            queryset = queryset.filter(filter_query)
 
         # If we have an offset cursor then offset the entire page by that amount.
         # We also always fetch an extra item in order to determine if there is a
@@ -704,7 +718,7 @@ class CursorPagination(BasePagination):
                 # The item in this position and the item following it
                 # have different positions. We can use this position as
                 # our marker.
-                has_item_with_unique_position = True
+                has_item_with_unique_position = position is not None
                 break
 
             # The item in this position has the same position as the item
@@ -757,7 +771,7 @@ class CursorPagination(BasePagination):
                 # The item in this position and the item following it
                 # have different positions. We can use this position as
                 # our marker.
-                has_item_with_unique_position = True
+                has_item_with_unique_position = position is not None
                 break
 
             # The item in this position has the same position as the item
@@ -795,6 +809,10 @@ class CursorPagination(BasePagination):
         """
         Return a tuple of strings, that may be used in an `order_by` method.
         """
+        # The default case is to check for an `ordering` attribute
+        # on this pagination instance.
+        ordering = self.ordering
+
         ordering_filters = [
             filter_cls for filter_cls in getattr(view, 'filter_backends', [])
             if hasattr(filter_cls, 'get_ordering')
@@ -805,26 +823,19 @@ class CursorPagination(BasePagination):
             # then we defer to that filter to determine the ordering.
             filter_cls = ordering_filters[0]
             filter_instance = filter_cls()
-            ordering = filter_instance.get_ordering(request, queryset, view)
-            assert ordering is not None, (
-                'Using cursor pagination, but filter class {filter_cls} '
-                'returned a `None` ordering.'.format(
-                    filter_cls=filter_cls.__name__
-                )
-            )
-        else:
-            # The default case is to check for an `ordering` attribute
-            # on this pagination instance.
-            ordering = self.ordering
-            assert ordering is not None, (
-                'Using cursor pagination, but no ordering attribute was declared '
-                'on the pagination class.'
-            )
-            assert '__' not in ordering, (
-                'Cursor pagination does not support double underscore lookups '
-                'for orderings. Orderings should be an unchanging, unique or '
-                'nearly-unique field on the model, such as "-created" or "pk".'
-            )
+            ordering_from_filter = filter_instance.get_ordering(request, queryset, view)
+            if ordering_from_filter:
+                ordering = ordering_from_filter
+
+        assert ordering is not None, (
+            'Using cursor pagination, but no ordering attribute was declared '
+            'on the pagination class.'
+        )
+        assert '__' not in ordering, (
+            'Cursor pagination does not support double underscore lookups '
+            'for orderings. Orderings should be an unchanging, unique or '
+            'nearly-unique field on the model, such as "-created" or "pk".'
+        )
 
         assert isinstance(ordering, (str, list, tuple)), (
             'Invalid ordering. Expected string or tuple, but got {type}'.format(
@@ -883,14 +894,14 @@ class CursorPagination(BasePagination):
             attr = instance[field_name]
         else:
             attr = getattr(instance, field_name)
-        return str(attr)
+        return None if attr is None else str(attr)
 
     def get_paginated_response(self, data):
-        return Response(OrderedDict([
-            ('next', self.get_next_link()),
-            ('previous', self.get_previous_link()),
-            ('results', data)
-        ]))
+        return Response({
+            'next': self.get_next_link(),
+            'previous': self.get_previous_link(),
+            'results': data,
+        })
 
     def get_paginated_response_schema(self, schema):
         return {
@@ -927,6 +938,8 @@ class CursorPagination(BasePagination):
 
     def get_schema_fields(self, view):
         assert coreapi is not None, 'coreapi must be installed to use `get_schema_fields()`'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema is not None, 'coreschema must be installed to use `get_schema_fields()`'
         fields = [
             coreapi.Field(
diff --git a/rest_framework/relations.py b/rest_framework/relations.py
index 62da685fb..4409bce77 100644
--- a/rest_framework/relations.py
+++ b/rest_framework/relations.py
@@ -1,6 +1,6 @@
 import contextlib
 import sys
-from collections import OrderedDict
+from operator import attrgetter
 from urllib import parse
 
 from django.core.exceptions import ImproperlyConfigured, ObjectDoesNotExist
@@ -71,6 +71,7 @@ class PKOnlyObject:
     instance, but still want to return an object with a .pk attribute,
     in order to keep the same interface as a regular model instance.
     """
+
     def __init__(self, pk):
         self.pk = pk
 
@@ -197,13 +198,9 @@ class RelatedField(Field):
         if cutoff is not None:
             queryset = queryset[:cutoff]
 
-        return OrderedDict([
-            (
-                self.to_representation(item),
-                self.display_value(item)
-            )
-            for item in queryset
-        ])
+        return {
+            self.to_representation(item): self.display_value(item) for item in queryset
+        }
 
     @property
     def choices(self):
@@ -464,7 +461,11 @@ class SlugRelatedField(RelatedField):
             self.fail('invalid')
 
     def to_representation(self, obj):
-        return getattr(obj, self.slug_field)
+        slug = self.slug_field
+        if "__" in slug:
+            # handling nested relationship if defined
+            slug = slug.replace('__', '.')
+        return attrgetter(slug)(obj)
 
 
 class ManyRelatedField(Field):
diff --git a/rest_framework/renderers.py b/rest_framework/renderers.py
index 8de0a77a1..db1fdd128 100644
--- a/rest_framework/renderers.py
+++ b/rest_framework/renderers.py
@@ -9,7 +9,7 @@ REST framework also provides an HTML renderer that renders the browsable API.
 
 import base64
 import contextlib
-from collections import OrderedDict
+import datetime
 from urllib import parse
 
 from django import forms
@@ -507,6 +507,9 @@ class BrowsableAPIRenderer(BaseRenderer):
             return self.render_form_for_serializer(serializer)
 
     def render_form_for_serializer(self, serializer):
+        if isinstance(serializer, serializers.ListSerializer):
+            return None
+
         if hasattr(serializer, 'initial_data'):
             serializer.is_valid()
 
@@ -556,10 +559,13 @@ class BrowsableAPIRenderer(BaseRenderer):
                 context['indent'] = 4
 
                 # strip HiddenField from output
+                is_list_serializer = isinstance(serializer, serializers.ListSerializer)
+                serializer = serializer.child if is_list_serializer else serializer
                 data = serializer.data.copy()
                 for name, field in serializer.fields.items():
                     if isinstance(field, serializers.HiddenField):
                         data.pop(name, None)
+                data = [data] if is_list_serializer else data
                 content = renderer.render(data, accepted, context)
                 # Renders returns bytes, but CharField expects a str.
                 content = content.decode()
@@ -653,7 +659,7 @@ class BrowsableAPIRenderer(BaseRenderer):
         raw_data_patch_form = self.get_raw_data_form(data, view, 'PATCH', request)
         raw_data_put_or_patch_form = raw_data_put_form or raw_data_patch_form
 
-        response_headers = OrderedDict(sorted(response.items()))
+        response_headers = dict(sorted(response.items()))
         renderer_content_type = ''
         if renderer:
             renderer_content_type = '%s' % renderer.media_type
@@ -1057,6 +1063,7 @@ class OpenAPIRenderer(BaseRenderer):
             def ignore_aliases(self, data):
                 return True
         Dumper.add_representer(SafeString, Dumper.represent_str)
+        Dumper.add_representer(datetime.timedelta, encoders.CustomScalar.represent_timedelta)
         return yaml.dump(data, default_flow_style=False, sort_keys=False, Dumper=Dumper).encode('utf-8')
 
 
diff --git a/rest_framework/routers.py b/rest_framework/routers.py
index 722fc50a6..fa5d16922 100644
--- a/rest_framework/routers.py
+++ b/rest_framework/routers.py
@@ -14,7 +14,7 @@ For example, you might have a `urls.py` that looks something like this:
     urlpatterns = router.urls
 """
 import itertools
-from collections import OrderedDict, namedtuple
+from collections import namedtuple
 
 from django.core.exceptions import ImproperlyConfigured
 from django.urls import NoReverseMatch, path, re_path
@@ -321,7 +321,7 @@ class APIRootView(views.APIView):
 
     def get(self, request, *args, **kwargs):
         # Return a plain {"name": "hyperlink"} response.
-        ret = OrderedDict()
+        ret = {}
         namespace = request.resolver_match.namespace
         for key, url_name in self.api_root_dict.items():
             if namespace:
@@ -365,7 +365,7 @@ class DefaultRouter(SimpleRouter):
         """
         Return a basic root view.
         """
-        api_root_dict = OrderedDict()
+        api_root_dict = {}
         list_name = self.routes[0].name
         for prefix, viewset, basename in self.registry:
             api_root_dict[prefix] = list_name.format(basename=basename)
diff --git a/rest_framework/schemas/coreapi.py b/rest_framework/schemas/coreapi.py
index 908518e9d..582aba196 100644
--- a/rest_framework/schemas/coreapi.py
+++ b/rest_framework/schemas/coreapi.py
@@ -1,11 +1,11 @@
 import warnings
-from collections import Counter, OrderedDict
+from collections import Counter
 from urllib import parse
 
 from django.db import models
 from django.utils.encoding import force_str
 
-from rest_framework import exceptions, serializers
+from rest_framework import RemovedInDRF317Warning, exceptions, serializers
 from rest_framework.compat import coreapi, coreschema, uritemplate
 from rest_framework.settings import api_settings
 
@@ -54,7 +54,7 @@ to customise schema structure.
 """
 
 
-class LinkNode(OrderedDict):
+class LinkNode(dict):
     def __init__(self):
         self.links = []
         self.methods_counter = Counter()
@@ -118,6 +118,8 @@ class SchemaGenerator(BaseSchemaGenerator):
 
     def __init__(self, title=None, url=None, description=None, patterns=None, urlconf=None, version=None):
         assert coreapi, '`coreapi` must be installed for schema support.'
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
         assert coreschema, '`coreschema` must be installed for schema support.'
 
         super().__init__(title, url, description, patterns, urlconf)
@@ -268,11 +270,11 @@ def field_to_schema(field):
         )
     elif isinstance(field, serializers.Serializer):
         return coreschema.Object(
-            properties=OrderedDict([
-                (key, field_to_schema(value))
+            properties={
+                key: field_to_schema(value)
                 for key, value
                 in field.fields.items()
-            ]),
+            },
             title=title,
             description=description
         )
@@ -351,6 +353,9 @@ class AutoSchema(ViewInspector):
             will be added to auto-generated fields, overwriting on `Field.name`
         """
         super().__init__()
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
+
         if manual_fields is None:
             manual_fields = []
         self._manual_fields = manual_fields
@@ -549,7 +554,7 @@ class AutoSchema(ViewInspector):
         if not update_with:
             return fields
 
-        by_name = OrderedDict((f.name, f) for f in fields)
+        by_name = {f.name: f for f in fields}
         for f in update_with:
             by_name[f.name] = f
         fields = list(by_name.values())
@@ -592,6 +597,9 @@ class ManualSchema(ViewInspector):
         * `description`: String description for view. Optional.
         """
         super().__init__()
+        if coreapi is not None:
+            warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
+
         assert all(isinstance(f, coreapi.Field) for f in fields), "`fields` must be a list of coreapi.Field instances"
         self._fields = fields
         self._description = description
@@ -613,4 +621,6 @@ class ManualSchema(ViewInspector):
 
 def is_enabled():
     """Is CoreAPI Mode enabled?"""
+    if coreapi is not None:
+        warnings.warn('CoreAPI compatibility is deprecated and will be removed in DRF 3.17', RemovedInDRF317Warning)
     return issubclass(api_settings.DEFAULT_SCHEMA_CLASS, AutoSchema)
diff --git a/rest_framework/schemas/openapi.py b/rest_framework/schemas/openapi.py
index ea220c631..d8707e1e1 100644
--- a/rest_framework/schemas/openapi.py
+++ b/rest_framework/schemas/openapi.py
@@ -1,6 +1,5 @@
 import re
 import warnings
-from collections import OrderedDict
 from decimal import Decimal
 from operator import attrgetter
 from urllib.parse import urljoin
@@ -340,7 +339,7 @@ class AutoSchema(ViewInspector):
         return paginator.get_schema_operation_parameters(view)
 
     def map_choicefield(self, field):
-        choices = list(OrderedDict.fromkeys(field.choices))  # preserve order and remove duplicates
+        choices = list(dict.fromkeys(field.choices))  # preserve order and remove duplicates
         if all(isinstance(choice, bool) for choice in choices):
             type = 'boolean'
         elif all(isinstance(choice, int) for choice in choices):
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 815e97e29..976a34836 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -15,7 +15,7 @@ import contextlib
 import copy
 import inspect
 import traceback
-from collections import OrderedDict, defaultdict
+from collections import defaultdict
 from collections.abc import Mapping
 
 from django.core.exceptions import FieldDoesNotExist, ImproperlyConfigured
@@ -315,7 +315,7 @@ class SerializerMetaclass(type):
             for name, f in base._declared_fields.items() if name not in known
         ]
 
-        return OrderedDict(base_fields + fields)
+        return dict(base_fields + fields)
 
     def __new__(cls, name, bases, attrs):
         attrs['_declared_fields'] = cls._get_declared_fields(bases, attrs)
@@ -353,6 +353,26 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
         'invalid': _('Invalid data. Expected a dictionary, but got {datatype}.')
     }
 
+    def set_value(self, dictionary, keys, value):
+        """
+        Similar to Python's built in `dictionary[key] = value`,
+        but takes a list of nested keys instead of a single key.
+
+        set_value({'a': 1}, [], {'b': 2}) -> {'a': 1, 'b': 2}
+        set_value({'a': 1}, ['x'], 2) -> {'a': 1, 'x': 2}
+        set_value({'a': 1}, ['x', 'y'], 2) -> {'a': 1, 'x': {'y': 2}}
+        """
+        if not keys:
+            dictionary.update(value)
+            return
+
+        for key in keys[:-1]:
+            if key not in dictionary:
+                dictionary[key] = {}
+            dictionary = dictionary[key]
+
+        dictionary[keys[-1]] = value
+
     @cached_property
     def fields(self):
         """
@@ -400,20 +420,20 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
         if hasattr(self, 'initial_data'):
             # initial_data may not be a valid type
             if not isinstance(self.initial_data, Mapping):
-                return OrderedDict()
+                return {}
 
-            return OrderedDict([
-                (field_name, field.get_value(self.initial_data))
+            return {
+                field_name: field.get_value(self.initial_data)
                 for field_name, field in self.fields.items()
                 if (field.get_value(self.initial_data) is not empty) and
                 not field.read_only
-            ])
+            }
 
-        return OrderedDict([
-            (field.field_name, field.get_initial())
+        return {
+            field.field_name: field.get_initial()
             for field in self.fields.values()
             if not field.read_only
-        ])
+        }
 
     def get_value(self, dictionary):
         # We override the default field access in order to support
@@ -448,7 +468,7 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
             if (field.read_only) and (field.default != empty) and (field.source != '*') and ('.' not in field.source)
         ]
 
-        defaults = OrderedDict()
+        defaults = {}
         for field in fields:
             try:
                 default = field.get_default()
@@ -481,8 +501,8 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
                 api_settings.NON_FIELD_ERRORS_KEY: [message]
             }, code='invalid')
 
-        ret = OrderedDict()
-        errors = OrderedDict()
+        ret = {}
+        errors = {}
         fields = self._writable_fields
 
         for field in fields:
@@ -499,7 +519,7 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
             except SkipField:
                 pass
             else:
-                set_value(ret, field.source_attrs, validated_value)
+                self.set_value(ret, field.source_attrs, validated_value)
 
         if errors:
             raise ValidationError(errors)
@@ -510,7 +530,7 @@ class Serializer(BaseSerializer, metaclass=SerializerMetaclass):
         """
         Object instance -> Dict of primitive datatypes.
         """
-        ret = OrderedDict()
+        ret = {}
         fields = self._readable_fields
 
         for field in fields:
@@ -596,6 +616,12 @@ class ListSerializer(BaseSerializer):
         self.min_length = kwargs.pop('min_length', None)
         assert self.child is not None, '`child` is a required argument.'
         assert not inspect.isclass(self.child), '`child` has not been instantiated.'
+
+        instance = kwargs.get('instance', [])
+        data = kwargs.get('data', [])
+        if instance and data:
+            assert len(data) == len(instance), 'Data and instance should have same length'
+
         super().__init__(*args, **kwargs)
         self.child.bind(field_name='', parent=self)
 
@@ -670,7 +696,13 @@ class ListSerializer(BaseSerializer):
         ret = []
         errors = []
 
-        for item in data:
+        for idx, item in enumerate(data):
+            if (
+                hasattr(self, 'instance')
+                and self.instance
+                and len(self.instance) > idx
+            ):
+                self.child.instance = self.instance[idx]
             try:
                 validated = self.child.run_validation(item)
             except ValidationError as exc:
@@ -1068,7 +1100,7 @@ class ModelSerializer(Serializer):
         )
 
         # Determine the fields that should be included on the serializer.
-        fields = OrderedDict()
+        fields = {}
 
         for field_name in field_names:
             # If the field is explicitly declared on the class then use that.
@@ -1553,16 +1585,16 @@ class ModelSerializer(Serializer):
         # which may map onto a model field. Any dotted field name lookups
         # cannot map to a field, and must be a traversal, so we're not
         # including those.
-        field_sources = OrderedDict(
-            (field.field_name, field.source) for field in self._writable_fields
+        field_sources = {
+            field.field_name: field.source for field in self._writable_fields
             if (field.source != '*') and ('.' not in field.source)
-        )
+        }
 
         # Special Case: Add read_only fields with defaults.
-        field_sources.update(OrderedDict(
-            (field.field_name, field.source) for field in self.fields.values()
+        field_sources.update({
+            field.field_name: field.source for field in self.fields.values()
             if (field.read_only) and (field.default != empty) and (field.source != '*') and ('.' not in field.source)
-        ))
+        })
 
         # Invert so we can find the serializer field names that correspond to
         # the model field names in the unique_together sets. This also allows
diff --git a/rest_framework/static/rest_framework/js/jquery-3.6.4.min.js b/rest_framework/static/rest_framework/js/jquery-3.6.4.min.js
new file mode 100644
index 000000000..0de648ed3
--- /dev/null
+++ b/rest_framework/static/rest_framework/js/jquery-3.6.4.min.js
@@ -0,0 +1,2 @@
+/*! jQuery v3.6.4 | (c) OpenJS Foundation and other contributors | jquery.org/license */
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diff --git a/rest_framework/templates/rest_framework/admin.html b/rest_framework/templates/rest_framework/admin.html
index 50833af28..616b55a34 100644
--- a/rest_framework/templates/rest_framework/admin.html
+++ b/rest_framework/templates/rest_framework/admin.html
@@ -250,7 +250,7 @@
             "csrfToken": "{{ csrf_token }}"
           }
         </script>
-        <script src="{% static "rest_framework/js/jquery-3.5.1.min.js" %}"></script>
+        <script src="{% static "rest_framework/js/jquery-3.6.4.min.js" %}"></script>
         <script src="{% static "rest_framework/js/ajax-form.js" %}"></script>
         <script src="{% static "rest_framework/js/csrf.js" %}"></script>
         <script src="{% static "rest_framework/js/bootstrap.min.js" %}"></script>
diff --git a/rest_framework/templates/rest_framework/base.html b/rest_framework/templates/rest_framework/base.html
index 533db1378..53c964f23 100644
--- a/rest_framework/templates/rest_framework/base.html
+++ b/rest_framework/templates/rest_framework/base.html
@@ -293,7 +293,7 @@
           "csrfToken": "{% if request %}{{ csrf_token }}{% endif %}"
         }
       </script>
-      <script src="{% static "rest_framework/js/jquery-3.5.1.min.js" %}"></script>
+      <script src="{% static "rest_framework/js/jquery-3.6.4.min.js" %}"></script>
       <script src="{% static "rest_framework/js/ajax-form.js" %}"></script>
       <script src="{% static "rest_framework/js/csrf.js" %}"></script>
       <script src="{% static "rest_framework/js/bootstrap.min.js" %}"></script>
diff --git a/rest_framework/templates/rest_framework/docs/error.html b/rest_framework/templates/rest_framework/docs/error.html
index 694f88a15..0c369e9e8 100644
--- a/rest_framework/templates/rest_framework/docs/error.html
+++ b/rest_framework/templates/rest_framework/docs/error.html
@@ -30,7 +30,7 @@ being applied unexpectedly?</p>
 
 <p>Your response status code is: <code>{{ response.status_code }}</code></p>
 
-<h3>401 Unauthorised.</h3>
+<h3>401 Unauthorized.</h3>
 <ul>
     <li>Do you have SessionAuthentication enabled?</li>
     <li>Are you logged in?</li>
@@ -66,6 +66,6 @@ at <code>rest_framework/docs/error.html</code>.</p>
 
 
 
-        <script src="{% static 'rest_framework/js/jquery-3.5.1.min.js' %}"></script>
+        <script src="{% static 'rest_framework/js/jquery-3.6.4.min.js' %}"></script>
     </body>
 </html>
diff --git a/rest_framework/templates/rest_framework/docs/index.html b/rest_framework/templates/rest_framework/docs/index.html
index dfd363772..8f8536fbe 100644
--- a/rest_framework/templates/rest_framework/docs/index.html
+++ b/rest_framework/templates/rest_framework/docs/index.html
@@ -38,7 +38,7 @@
         {% include "rest_framework/docs/auth/basic.html" %}
         {% include "rest_framework/docs/auth/session.html" %}
 
-        <script src="{% static 'rest_framework/js/jquery-3.5.1.min.js' %}"></script>
+        <script src="{% static 'rest_framework/js/jquery-3.6.4.min.js' %}"></script>
         <script src="{% static 'rest_framework/js/bootstrap.min.js' %}"></script>
         <script src="{% static 'rest_framework/docs/js/jquery.json-view.min.js' %}"></script>
         <script src="{% static 'rest_framework/docs/js/api.js' %}"></script>
diff --git a/rest_framework/templates/rest_framework/horizontal/select_multiple.html b/rest_framework/templates/rest_framework/horizontal/select_multiple.html
index 36ff9fd0d..12e781cc6 100644
--- a/rest_framework/templates/rest_framework/horizontal/select_multiple.html
+++ b/rest_framework/templates/rest_framework/horizontal/select_multiple.html
@@ -11,7 +11,7 @@
   {% endif %}
 
   <div class="col-sm-10">
-    <select multiple {{ field.choices|yesno:",disabled" }} class="form-control" name="{{ field.name }}">
+    <select multiple class="form-control" name="{{ field.name }}">
       {% for select in field.iter_options %}
         {% if select.start_option_group %}
           <optgroup label="{{ select.label }}">
diff --git a/rest_framework/templatetags/rest_framework.py b/rest_framework/templatetags/rest_framework.py
index ccd9430b4..53916d3f2 100644
--- a/rest_framework/templatetags/rest_framework.py
+++ b/rest_framework/templatetags/rest_framework.py
@@ -1,5 +1,4 @@
 import re
-from collections import OrderedDict
 
 from django import template
 from django.template import loader
@@ -49,10 +48,10 @@ def with_location(fields, location):
 @register.simple_tag
 def form_for_link(link):
     import coreschema
-    properties = OrderedDict([
-        (field.name, field.schema or coreschema.String())
+    properties = {
+        field.name: field.schema or coreschema.String()
         for field in link.fields
-    ])
+    }
     required = [
         field.name
         for field in link.fields
@@ -272,7 +271,7 @@ def schema_links(section, sec_key=None):
             links.update(new_links)
 
     if sec_key is not None:
-        new_links = OrderedDict()
+        new_links = {}
         for link_key, link in links.items():
             new_key = NESTED_FORMAT % (sec_key, link_key)
             new_links.update({new_key: link})
diff --git a/rest_framework/utils/encoders.py b/rest_framework/utils/encoders.py
index 35a89eb09..aa4542286 100644
--- a/rest_framework/utils/encoders.py
+++ b/rest_framework/utils/encoders.py
@@ -65,3 +65,14 @@ class JSONEncoder(json.JSONEncoder):
         elif hasattr(obj, '__iter__'):
             return tuple(item for item in obj)
         return super().default(obj)
+
+
+class CustomScalar:
+    """
+    CustomScalar that knows how to encode timedelta that renderer
+    can understand.
+    """
+    @classmethod
+    def represent_timedelta(cls, dumper, data):
+        value = str(data.total_seconds())
+        return dumper.represent_scalar('tag:yaml.org,2002:str', value)
diff --git a/rest_framework/utils/model_meta.py b/rest_framework/utils/model_meta.py
index 4cc93b8ef..bd5d9177c 100644
--- a/rest_framework/utils/model_meta.py
+++ b/rest_framework/utils/model_meta.py
@@ -5,7 +5,7 @@ relationships and their associated metadata.
 
 Usage: `get_field_info(model)` returns a `FieldInfo` instance.
 """
-from collections import OrderedDict, namedtuple
+from collections import namedtuple
 
 FieldInfo = namedtuple('FieldResult', [
     'pk',  # Model field instance
@@ -58,7 +58,7 @@ def _get_pk(opts):
 
 
 def _get_fields(opts):
-    fields = OrderedDict()
+    fields = {}
     for field in [field for field in opts.fields if field.serialize and not field.remote_field]:
         fields[field.name] = field
 
@@ -71,9 +71,9 @@ def _get_to_field(field):
 
 def _get_forward_relationships(opts):
     """
-    Returns an `OrderedDict` of field names to `RelationInfo`.
+    Returns a dict of field names to `RelationInfo`.
     """
-    forward_relations = OrderedDict()
+    forward_relations = {}
     for field in [field for field in opts.fields if field.serialize and field.remote_field]:
         forward_relations[field.name] = RelationInfo(
             model_field=field,
@@ -103,9 +103,9 @@ def _get_forward_relationships(opts):
 
 def _get_reverse_relationships(opts):
     """
-    Returns an `OrderedDict` of field names to `RelationInfo`.
+    Returns a dict of field names to `RelationInfo`.
     """
-    reverse_relations = OrderedDict()
+    reverse_relations = {}
     all_related_objects = [r for r in opts.related_objects if not r.field.many_to_many]
     for relation in all_related_objects:
         accessor_name = relation.get_accessor_name()
@@ -139,19 +139,14 @@ def _get_reverse_relationships(opts):
 
 
 def _merge_fields_and_pk(pk, fields):
-    fields_and_pk = OrderedDict()
-    fields_and_pk['pk'] = pk
-    fields_and_pk[pk.name] = pk
+    fields_and_pk = {'pk': pk, pk.name: pk}
     fields_and_pk.update(fields)
 
     return fields_and_pk
 
 
 def _merge_relationships(forward_relations, reverse_relations):
-    return OrderedDict(
-        list(forward_relations.items()) +
-        list(reverse_relations.items())
-    )
+    return {**forward_relations, **reverse_relations}
 
 
 def is_abstract_model(model):
diff --git a/rest_framework/utils/serializer_helpers.py b/rest_framework/utils/serializer_helpers.py
index 6ca794584..0e59aa66a 100644
--- a/rest_framework/utils/serializer_helpers.py
+++ b/rest_framework/utils/serializer_helpers.py
@@ -1,6 +1,5 @@
 import contextlib
 import sys
-from collections import OrderedDict
 from collections.abc import Mapping, MutableMapping
 
 from django.utils.encoding import force_str
@@ -8,7 +7,7 @@ from django.utils.encoding import force_str
 from rest_framework.utils import json
 
 
-class ReturnDict(OrderedDict):
+class ReturnDict(dict):
     """
     Return object from `serializer.data` for the `Serializer` class.
     Includes a backlink to the serializer instance for renderers
@@ -161,7 +160,7 @@ class BindingDict(MutableMapping):
 
     def __init__(self, serializer):
         self.serializer = serializer
-        self.fields = OrderedDict()
+        self.fields = {}
 
     def __setitem__(self, key, field):
         self.fields[key] = field
diff --git a/rest_framework/utils/timezone.py b/rest_framework/utils/timezone.py
new file mode 100644
index 000000000..3257c8e27
--- /dev/null
+++ b/rest_framework/utils/timezone.py
@@ -0,0 +1,25 @@
+from datetime import datetime, timezone, tzinfo
+
+
+def datetime_exists(dt):
+    """Check if a datetime exists. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
+    # There are no non-existent times in UTC, and comparisons between
+    # aware time zones always compare absolute times; if a datetime is
+    # not equal to the same datetime represented in UTC, it is imaginary.
+    return dt.astimezone(timezone.utc) == dt
+
+
+def datetime_ambiguous(dt: datetime):
+    """Check whether a datetime is ambiguous. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
+    # If a datetime exists and its UTC offset changes in response to
+    # changing `fold`, it is ambiguous in the zone specified.
+    return datetime_exists(dt) and (
+        dt.replace(fold=not dt.fold).utcoffset() != dt.utcoffset()
+    )
+
+
+def valid_datetime(dt):
+    """Returns True if the datetime is not ambiguous or imaginary, False otherwise."""
+    if isinstance(dt.tzinfo, tzinfo) and not datetime_ambiguous(dt):
+        return True
+    return False
diff --git a/rest_framework/validators.py b/rest_framework/validators.py
index a5cb75a84..07ad11b47 100644
--- a/rest_framework/validators.py
+++ b/rest_framework/validators.py
@@ -79,6 +79,15 @@ class UniqueValidator:
             smart_repr(self.queryset)
         )
 
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return NotImplemented
+        return (self.message == other.message
+                and self.requires_context == other.requires_context
+                and self.queryset == other.queryset
+                and self.lookup == other.lookup
+                )
+
 
 class UniqueTogetherValidator:
     """
@@ -166,6 +175,16 @@ class UniqueTogetherValidator:
             smart_repr(self.fields)
         )
 
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return NotImplemented
+        return (self.message == other.message
+                and self.requires_context == other.requires_context
+                and self.missing_message == other.missing_message
+                and self.queryset == other.queryset
+                and self.fields == other.fields
+                )
+
 
 class ProhibitSurrogateCharactersValidator:
     message = _('Surrogate characters are not allowed: U+{code_point:X}.')
@@ -177,6 +196,13 @@ class ProhibitSurrogateCharactersValidator:
             message = self.message.format(code_point=ord(surrogate_character))
             raise ValidationError(message, code=self.code)
 
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return NotImplemented
+        return (self.message == other.message
+                and self.code == other.code
+                )
+
 
 class BaseUniqueForValidator:
     message = None
@@ -230,6 +256,17 @@ class BaseUniqueForValidator:
                 self.field: message
             }, code='unique')
 
+    def __eq__(self, other):
+        if not isinstance(other, self.__class__):
+            return NotImplemented
+        return (self.message == other.message
+                and self.missing_message == other.missing_message
+                and self.requires_context == other.requires_context
+                and self.queryset == other.queryset
+                and self.field == other.field
+                and self.date_field == other.date_field
+                )
+
     def __repr__(self):
         return '<%s(queryset=%s, field=%s, date_field=%s)>' % (
             self.__class__.__name__,
diff --git a/rest_framework/versioning.py b/rest_framework/versioning.py
index 78cfc9dc8..a1c0ce4d7 100644
--- a/rest_framework/versioning.py
+++ b/rest_framework/versioning.py
@@ -81,8 +81,10 @@ class URLPathVersioning(BaseVersioning):
 
     def reverse(self, viewname, args=None, kwargs=None, request=None, format=None, **extra):
         if request.version is not None:
-            kwargs = {} if (kwargs is None) else kwargs
-            kwargs[self.version_param] = request.version
+            kwargs = {
+                self.version_param: request.version,
+                **(kwargs or {})
+            }
 
         return super().reverse(
             viewname, args, kwargs, request, format, **extra
@@ -117,15 +119,16 @@ class NamespaceVersioning(BaseVersioning):
 
     def determine_version(self, request, *args, **kwargs):
         resolver_match = getattr(request, 'resolver_match', None)
-        if resolver_match is None or not resolver_match.namespace:
-            return self.default_version
+        if resolver_match is not None and resolver_match.namespace:
+            # Allow for possibly nested namespaces.
+            possible_versions = resolver_match.namespace.split(':')
+            for version in possible_versions:
+                if self.is_allowed_version(version):
+                    return version
 
-        # Allow for possibly nested namespaces.
-        possible_versions = resolver_match.namespace.split(':')
-        for version in possible_versions:
-            if self.is_allowed_version(version):
-                return version
-        raise exceptions.NotFound(self.invalid_version_message)
+        if not self.is_allowed_version(self.default_version):
+            raise exceptions.NotFound(self.invalid_version_message)
+        return self.default_version
 
     def reverse(self, viewname, args=None, kwargs=None, request=None, format=None, **extra):
         if request.version is not None:
diff --git a/rest_framework/viewsets.py b/rest_framework/viewsets.py
index 1c56f61e8..2eba17b4a 100644
--- a/rest_framework/viewsets.py
+++ b/rest_framework/viewsets.py
@@ -16,7 +16,6 @@ automatically.
     router.register(r'users', UserViewSet, 'user')
     urlpatterns = router.urls
 """
-from collections import OrderedDict
 from functools import update_wrapper
 from inspect import getmembers
 
@@ -183,7 +182,7 @@ class ViewSetMixin:
 
         This method will noop if `detail` was not provided as a view initkwarg.
         """
-        action_urls = OrderedDict()
+        action_urls = {}
 
         # exit early if `detail` has not been provided
         if self.detail is None:
diff --git a/setup.cfg b/setup.cfg
index 294e9afdd..487d99db9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,6 +3,8 @@ license_files = LICENSE.md
 
 [tool:pytest]
 addopts=--tb=short --strict-markers -ra
+testspath = tests
+filterwarnings = ignore:CoreAPI compatibility is deprecated*:rest_framework.RemovedInDRF317Warning
 
 [flake8]
 ignore = E501,W503,W504
diff --git a/setup.py b/setup.py
index 9a5b272f3..6afd5e05e 100755
--- a/setup.py
+++ b/setup.py
@@ -37,7 +37,8 @@ an older version of Django REST Framework:
 
 
 def read(f):
-    return open(f, 'r', encoding='utf-8').read()
+    with open(f, 'r', encoding='utf-8') as file:
+        return file.read()
 
 
 def get_version(package):
@@ -82,7 +83,7 @@ setup(
     author_email='tom@tomchristie.com',  # SEE NOTE BELOW (*)
     packages=find_packages(exclude=['tests*']),
     include_package_data=True,
-    install_requires=["django>=3.0", "pytz"],
+    install_requires=["django>=3.0", 'backports.zoneinfo;python_version<"3.9"'],
     python_requires=">=3.6",
     zip_safe=False,
     classifiers=[
diff --git a/tests/schemas/test_coreapi.py b/tests/schemas/test_coreapi.py
index eddc5243e..98fd46f9f 100644
--- a/tests/schemas/test_coreapi.py
+++ b/tests/schemas/test_coreapi.py
@@ -7,16 +7,24 @@ from django.test import TestCase, override_settings
 from django.urls import include, path
 
 from rest_framework import (
-    filters, generics, pagination, permissions, serializers
+    RemovedInDRF317Warning, filters, generics, pagination, permissions,
+    serializers
 )
 from rest_framework.compat import coreapi, coreschema
 from rest_framework.decorators import action, api_view, schema
+from rest_framework.filters import (
+    BaseFilterBackend, OrderingFilter, SearchFilter
+)
+from rest_framework.pagination import (
+    BasePagination, CursorPagination, LimitOffsetPagination,
+    PageNumberPagination
+)
 from rest_framework.request import Request
 from rest_framework.routers import DefaultRouter, SimpleRouter
 from rest_framework.schemas import (
     AutoSchema, ManualSchema, SchemaGenerator, get_schema_view
 )
-from rest_framework.schemas.coreapi import field_to_schema
+from rest_framework.schemas.coreapi import field_to_schema, is_enabled
 from rest_framework.schemas.generators import EndpointEnumerator
 from rest_framework.schemas.utils import is_list_view
 from rest_framework.test import APIClient, APIRequestFactory
@@ -1433,3 +1441,46 @@ def test_schema_handles_exception():
     response.render()
     assert response.status_code == 403
     assert b"You do not have permission to perform this action." in response.content
+
+
+@pytest.mark.skipif(not coreapi, reason='coreapi is not installed')
+def test_coreapi_deprecation():
+    with pytest.warns(RemovedInDRF317Warning):
+        SchemaGenerator()
+
+    with pytest.warns(RemovedInDRF317Warning):
+        AutoSchema()
+
+    with pytest.warns(RemovedInDRF317Warning):
+        ManualSchema({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        deprecated_filter = OrderingFilter()
+        deprecated_filter.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        deprecated_filter = BaseFilterBackend()
+        deprecated_filter.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        deprecated_filter = SearchFilter()
+        deprecated_filter.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        paginator = BasePagination()
+        paginator.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        paginator = PageNumberPagination()
+        paginator.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        paginator = LimitOffsetPagination()
+        paginator.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        paginator = CursorPagination()
+        paginator.get_schema_fields({})
+
+    with pytest.warns(RemovedInDRF317Warning):
+        is_enabled()
diff --git a/tests/schemas/test_openapi.py b/tests/schemas/test_openapi.py
index 0ea6d1ff9..1eb5b84b7 100644
--- a/tests/schemas/test_openapi.py
+++ b/tests/schemas/test_openapi.py
@@ -1162,6 +1162,31 @@ class TestGenerator(TestCase):
         assert b'"openapi": "' in ret
         assert b'"default": "0.0"' in ret
 
+    def test_schema_rendering_to_yaml(self):
+        patterns = [
+            path('example/', views.ExampleGenericAPIView.as_view()),
+        ]
+        generator = SchemaGenerator(patterns=patterns)
+
+        request = create_request('/')
+        schema = generator.get_schema(request=request)
+        ret = OpenAPIRenderer().render(schema)
+        assert b"openapi: " in ret
+        assert b"default: '0.0'" in ret
+
+    def test_schema_rendering_timedelta_to_yaml_with_validator(self):
+
+        patterns = [
+            path('example/', views.ExampleValidatedAPIView.as_view()),
+        ]
+        generator = SchemaGenerator(patterns=patterns)
+
+        request = create_request('/')
+        schema = generator.get_schema(request=request)
+        ret = OpenAPIRenderer().render(schema)
+        assert b"openapi: " in ret
+        assert b"duration:\n          type: string\n          minimum: \'10.0\'\n" in ret
+
     def test_schema_with_no_paths(self):
         patterns = []
         generator = SchemaGenerator(patterns=patterns)
diff --git a/tests/schemas/views.py b/tests/schemas/views.py
index f1ed0bd4e..c08208bf2 100644
--- a/tests/schemas/views.py
+++ b/tests/schemas/views.py
@@ -134,6 +134,11 @@ class ExampleValidatedSerializer(serializers.Serializer):
     ip4 = serializers.IPAddressField(protocol='ipv4')
     ip6 = serializers.IPAddressField(protocol='ipv6')
     ip = serializers.IPAddressField()
+    duration = serializers.DurationField(
+        validators=(
+            MinValueValidator(timedelta(seconds=10)),
+        )
+    )
 
 
 class ExampleValidatedAPIView(generics.GenericAPIView):
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 56e2a45ba..03584431e 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -5,10 +5,18 @@ import re
 import sys
 import uuid
 from decimal import ROUND_DOWN, ROUND_UP, Decimal
+from enum import auto
+from unittest.mock import patch
 
 import pytest
-import pytz
+
+try:
+    import pytz
+except ImportError:
+    pytz = None
+
 from django.core.exceptions import ValidationError as DjangoValidationError
+from django.db.models import IntegerChoices, TextChoices
 from django.http import QueryDict
 from django.test import TestCase, override_settings
 from django.utils.timezone import activate, deactivate, override
@@ -21,6 +29,11 @@ from rest_framework.fields import (
 )
 from tests.models import UUIDForeignKeyTarget
 
+if sys.version_info >= (3, 9):
+    from zoneinfo import ZoneInfo
+else:
+    from backports.zoneinfo import ZoneInfo
+
 utc = datetime.timezone.utc
 
 # Tests for helper functions.
@@ -651,7 +664,7 @@ class FieldValues:
     """
     Base class for testing valid and invalid input values.
     """
-    def test_valid_inputs(self):
+    def test_valid_inputs(self, *args):
         """
         Ensure that valid values return the expected validated data.
         """
@@ -659,7 +672,7 @@ class FieldValues:
             assert self.field.run_validation(input_value) == expected_output, \
                 'input value: {}'.format(repr(input_value))
 
-    def test_invalid_inputs(self):
+    def test_invalid_inputs(self, *args):
         """
         Ensure that invalid values raise the expected validation error.
         """
@@ -669,7 +682,7 @@ class FieldValues:
             assert exc_info.value.detail == expected_failure, \
                 'input value: {}'.format(repr(input_value))
 
-    def test_outputs(self):
+    def test_outputs(self, *args):
         for output_value, expected_output in get_items(self.outputs):
             assert self.field.to_representation(output_value) == expected_output, \
                 'output value: {}'.format(repr(output_value))
@@ -682,8 +695,24 @@ class TestBooleanField(FieldValues):
     Valid and invalid values for `BooleanField`.
     """
     valid_inputs = {
+        'True': True,
+        'TRUE': True,
+        'tRuE': True,
+        't': True,
+        'T': True,
         'true': True,
+        'on': True,
+        'ON': True,
+        'oN': True,
+        'False': False,
+        'FALSE': False,
+        'fALse': False,
+        'f': False,
+        'F': False,
         'false': False,
+        'off': False,
+        'OFF': False,
+        'oFf': False,
         '1': True,
         '0': False,
         1: True,
@@ -696,8 +725,24 @@ class TestBooleanField(FieldValues):
         None: ['This field may not be null.']
     }
     outputs = {
+        'True': True,
+        'TRUE': True,
+        'tRuE': True,
+        't': True,
+        'T': True,
         'true': True,
+        'on': True,
+        'ON': True,
+        'oN': True,
+        'False': False,
+        'FALSE': False,
+        'fALse': False,
+        'f': False,
+        'F': False,
         'false': False,
+        'off': False,
+        'OFF': False,
+        'oFf': False,
         '1': True,
         '0': False,
         1: True,
@@ -1208,6 +1253,17 @@ class TestMinMaxDecimalField(FieldValues):
         min_value=10, max_value=20
     )
 
+    def test_warning_when_not_decimal_types(self, caplog):
+        import logging
+        serializers.DecimalField(
+            max_digits=3, decimal_places=1,
+            min_value=10, max_value=20
+        )
+        assert caplog.record_tuples == [
+            ("rest_framework.fields", logging.WARNING, "max_value in DecimalField should be Decimal type."),
+            ("rest_framework.fields", logging.WARNING, "min_value in DecimalField should be Decimal type.")
+        ]
+
 
 class TestAllowEmptyStrDecimalFieldWithValidators(FieldValues):
     """
@@ -1505,12 +1561,12 @@ class TestTZWithDateTimeField(FieldValues):
     @classmethod
     def setup_class(cls):
         # use class setup method, as class-level attribute will still be evaluated even if test is skipped
-        kolkata = pytz.timezone('Asia/Kolkata')
+        kolkata = ZoneInfo('Asia/Kolkata')
 
         cls.valid_inputs = {
-            '2016-12-19T10:00:00': kolkata.localize(datetime.datetime(2016, 12, 19, 10)),
-            '2016-12-19T10:00:00+05:30': kolkata.localize(datetime.datetime(2016, 12, 19, 10)),
-            datetime.datetime(2016, 12, 19, 10): kolkata.localize(datetime.datetime(2016, 12, 19, 10)),
+            '2016-12-19T10:00:00': datetime.datetime(2016, 12, 19, 10, tzinfo=kolkata),
+            '2016-12-19T10:00:00+05:30': datetime.datetime(2016, 12, 19, 10, tzinfo=kolkata),
+            datetime.datetime(2016, 12, 19, 10): datetime.datetime(2016, 12, 19, 10, tzinfo=kolkata),
         }
         cls.invalid_inputs = {}
         cls.outputs = {
@@ -1529,7 +1585,7 @@ class TestDefaultTZDateTimeField(TestCase):
     @classmethod
     def setup_class(cls):
         cls.field = serializers.DateTimeField()
-        cls.kolkata = pytz.timezone('Asia/Kolkata')
+        cls.kolkata = ZoneInfo('Asia/Kolkata')
 
     def assertUTC(self, tzinfo):
         """
@@ -1551,18 +1607,17 @@ class TestDefaultTZDateTimeField(TestCase):
         self.assertUTC(self.field.default_timezone())
 
 
-@pytest.mark.skipif(pytz is None, reason='pytz not installed')
 @override_settings(TIME_ZONE='UTC', USE_TZ=True)
 class TestCustomTimezoneForDateTimeField(TestCase):
 
     @classmethod
     def setup_class(cls):
-        cls.kolkata = pytz.timezone('Asia/Kolkata')
+        cls.kolkata = ZoneInfo('Asia/Kolkata')
         cls.date_format = '%d/%m/%Y %H:%M'
 
     def test_should_render_date_time_in_default_timezone(self):
         field = serializers.DateTimeField(default_timezone=self.kolkata, format=self.date_format)
-        dt = datetime.datetime(2018, 2, 8, 14, 15, 16, tzinfo=pytz.utc)
+        dt = datetime.datetime(2018, 2, 8, 14, 15, 16, tzinfo=ZoneInfo("UTC"))
 
         with override(self.kolkata):
             rendered_date = field.to_representation(dt)
@@ -1572,6 +1627,33 @@ class TestCustomTimezoneForDateTimeField(TestCase):
         assert rendered_date == rendered_date_in_timezone
 
 
+@pytest.mark.skipif(pytz is None, reason="As Django 4.0 has deprecated pytz, this test should eventually be able to get removed.")
+class TestPytzNaiveDayLightSavingTimeTimeZoneDateTimeField(FieldValues):
+    """
+    Invalid values for `DateTimeField` with datetime in DST shift (non-existing or ambiguous) and timezone with DST.
+    Timezone America/New_York has DST shift from 2017-03-12T02:00:00 to 2017-03-12T03:00:00 and
+     from 2017-11-05T02:00:00 to 2017-11-05T01:00:00 in 2017.
+    """
+    valid_inputs = {}
+    invalid_inputs = {
+        '2017-03-12T02:30:00': ['Invalid datetime for the timezone "America/New_York".'],
+        '2017-11-05T01:30:00': ['Invalid datetime for the timezone "America/New_York".']
+    }
+    outputs = {}
+
+    if pytz:
+        class MockTimezone(pytz.BaseTzInfo):
+            @staticmethod
+            def localize(value, is_dst):
+                raise pytz.InvalidTimeError()
+
+            def __str__(self):
+                return 'America/New_York'
+
+        field = serializers.DateTimeField(default_timezone=MockTimezone())
+
+
+@patch('rest_framework.utils.timezone.datetime_ambiguous', return_value=True)
 class TestNaiveDayLightSavingTimeTimeZoneDateTimeField(FieldValues):
     """
     Invalid values for `DateTimeField` with datetime in DST shift (non-existing or ambiguous) and timezone with DST.
@@ -1585,15 +1667,11 @@ class TestNaiveDayLightSavingTimeTimeZoneDateTimeField(FieldValues):
     }
     outputs = {}
 
-    class MockTimezone(pytz.BaseTzInfo):
-        @staticmethod
-        def localize(value, is_dst):
-            raise pytz.InvalidTimeError()
-
+    class MockZoneInfoTimezone(datetime.tzinfo):
         def __str__(self):
             return 'America/New_York'
 
-    field = serializers.DateTimeField(default_timezone=MockTimezone())
+    field = serializers.DateTimeField(default_timezone=MockZoneInfoTimezone())
 
 
 class TestTimeField(FieldValues):
@@ -1797,6 +1875,54 @@ class TestChoiceField(FieldValues):
             field.run_validation(2)
         assert exc_info.value.detail == ['"2" is not a valid choice.']
 
+    def test_integer_choices(self):
+        class ChoiceCase(IntegerChoices):
+            first = auto()
+            second = auto()
+        # Enum validate
+        choices = [
+            (ChoiceCase.first, "1"),
+            (ChoiceCase.second, "2")
+        ]
+
+        field = serializers.ChoiceField(choices=choices)
+        assert field.run_validation(1) == 1
+        assert field.run_validation(ChoiceCase.first) == 1
+        assert field.run_validation("1") == 1
+
+        choices = [
+            (ChoiceCase.first.value, "1"),
+            (ChoiceCase.second.value, "2")
+        ]
+
+        field = serializers.ChoiceField(choices=choices)
+        assert field.run_validation(1) == 1
+        assert field.run_validation(ChoiceCase.first) == 1
+        assert field.run_validation("1") == 1
+
+    def test_text_choices(self):
+        class ChoiceCase(TextChoices):
+            first = auto()
+            second = auto()
+        # Enum validate
+        choices = [
+            (ChoiceCase.first, "first"),
+            (ChoiceCase.second, "second")
+        ]
+
+        field = serializers.ChoiceField(choices=choices)
+        assert field.run_validation(ChoiceCase.first) == "first"
+        assert field.run_validation("first") == "first"
+
+        choices = [
+            (ChoiceCase.first.value, "first"),
+            (ChoiceCase.second.value, "second")
+        ]
+
+        field = serializers.ChoiceField(choices=choices)
+        assert field.run_validation(ChoiceCase.first) == "first"
+        assert field.run_validation("first") == "first"
+
 
 class TestChoiceFieldWithType(FieldValues):
     """
diff --git a/tests/test_metadata.py b/tests/test_metadata.py
index 4abc0fc07..1bdc8697c 100644
--- a/tests/test_metadata.py
+++ b/tests/test_metadata.py
@@ -324,6 +324,13 @@ class TestSimpleMetadataFieldInfo(TestCase):
             )
         assert 'choices' not in field_info
 
+    def test_decimal_field_info_type(self):
+        options = metadata.SimpleMetadata()
+        field_info = options.get_field_info(serializers.DecimalField(max_digits=18, decimal_places=4))
+        assert field_info['type'] == 'decimal'
+        assert field_info['max_digits'] == 18
+        assert field_info['decimal_places'] == 4
+
 
 class TestModelSerializerMetadata(TestCase):
     def test_read_only_primary_key_related_field(self):
diff --git a/tests/test_model_serializer.py b/tests/test_model_serializer.py
index 419eae632..c5ac888f5 100644
--- a/tests/test_model_serializer.py
+++ b/tests/test_model_serializer.py
@@ -10,7 +10,6 @@ import decimal
 import json  # noqa
 import sys
 import tempfile
-from collections import OrderedDict
 
 import django
 import pytest
@@ -762,7 +761,7 @@ class TestRelationalFieldDisplayValue(TestCase):
                 fields = '__all__'
 
         serializer = TestSerializer()
-        expected = OrderedDict([(1, 'Red Color'), (2, 'Yellow Color'), (3, 'Green Color')])
+        expected = {1: 'Red Color', 2: 'Yellow Color', 3: 'Green Color'}
         self.assertEqual(serializer.fields['color'].choices, expected)
 
     def test_custom_display_value(self):
@@ -778,7 +777,7 @@ class TestRelationalFieldDisplayValue(TestCase):
                 fields = '__all__'
 
         serializer = TestSerializer()
-        expected = OrderedDict([(1, 'My Red Color'), (2, 'My Yellow Color'), (3, 'My Green Color')])
+        expected = {1: 'My Red Color', 2: 'My Yellow Color', 3: 'My Green Color'}
         self.assertEqual(serializer.fields['color'].choices, expected)
 
 
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
index 2812c4489..d606986ab 100644
--- a/tests/test_pagination.py
+++ b/tests/test_pagination.py
@@ -632,6 +632,24 @@ class CursorPaginationTestsMixin:
         ordering = self.pagination.get_ordering(request, [], MockView())
         assert ordering == ('created',)
 
+    def test_use_with_ordering_filter_without_ordering_default_value(self):
+        class MockView:
+            filter_backends = (filters.OrderingFilter,)
+            ordering_fields = ['username', 'created']
+
+        request = Request(factory.get('/'))
+        ordering = self.pagination.get_ordering(request, [], MockView())
+        # it gets the value of `ordering` provided by CursorPagination
+        assert ordering == ('created',)
+
+        request = Request(factory.get('/', {'ordering': 'username'}))
+        ordering = self.pagination.get_ordering(request, [], MockView())
+        assert ordering == ('username',)
+
+        request = Request(factory.get('/', {'ordering': 'invalid'}))
+        ordering = self.pagination.get_ordering(request, [], MockView())
+        assert ordering == ('created',)
+
     def test_cursor_pagination(self):
         (previous, current, next, previous_url, next_url) = self.get_pages('/')
 
@@ -951,17 +969,24 @@ class TestCursorPagination(CursorPaginationTestsMixin):
             def __init__(self, items):
                 self.items = items
 
-            def filter(self, created__gt=None, created__lt=None):
+            def filter(self, q):
+                q_args = dict(q.deconstruct()[1])
+                if not q_args:
+                    # django 3.0.x artifact
+                    q_args = dict(q.deconstruct()[2])
+                created__gt = q_args.get('created__gt')
+                created__lt = q_args.get('created__lt')
+
                 if created__gt is not None:
                     return MockQuerySet([
                         item for item in self.items
-                        if item.created > int(created__gt)
+                        if item.created is None or item.created > int(created__gt)
                     ])
 
                 assert created__lt is not None
                 return MockQuerySet([
                     item for item in self.items
-                    if item.created < int(created__lt)
+                    if item.created is None or item.created < int(created__lt)
                 ])
 
             def order_by(self, *ordering):
@@ -1080,6 +1105,127 @@ class TestCursorPaginationWithValueQueryset(CursorPaginationTestsMixin, TestCase
         return (previous, current, next, previous_url, next_url)
 
 
+class NullableCursorPaginationModel(models.Model):
+    created = models.IntegerField(null=True)
+
+
+class TestCursorPaginationWithNulls(TestCase):
+    """
+    Unit tests for `pagination.CursorPagination` with ordering on a nullable field.
+    """
+
+    def setUp(self):
+        class ExamplePagination(pagination.CursorPagination):
+            page_size = 1
+            ordering = 'created'
+
+        self.pagination = ExamplePagination()
+        data = [
+            None, None, 3, 4
+        ]
+        for idx in data:
+            NullableCursorPaginationModel.objects.create(created=idx)
+
+        self.queryset = NullableCursorPaginationModel.objects.all()
+
+    get_pages = TestCursorPagination.get_pages
+
+    def test_ascending(self):
+        """Test paginating one row at a time, current should go 1, 2, 3, 4, 3, 2, 1."""
+        (previous, current, next, previous_url, next_url) = self.get_pages('/')
+
+        assert previous is None
+        assert current == [None]
+        assert next == [None]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [None]
+        assert current == [None]
+        assert next == [3]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [3]  # [None] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L789
+        assert current == [3]
+        assert next == [4]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [3]
+        assert current == [4]
+        assert next is None
+        assert next_url is None
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous == [None]
+        assert current == [3]
+        assert next == [4]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous == [None]
+        assert current == [None]
+        assert next == [None]  # [3] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L731
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous is None
+        assert current == [None]
+        assert next == [None]
+
+    def test_descending(self):
+        """Test paginating one row at a time, current should go 4, 3, 2, 1, 2, 3, 4."""
+        self.pagination.ordering = ('-created',)
+        (previous, current, next, previous_url, next_url) = self.get_pages('/')
+
+        assert previous is None
+        assert current == [4]
+        assert next == [3]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [None]  # [4] paging artifact
+        assert current == [3]
+        assert next == [None]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [None]  # [3] paging artifact
+        assert current == [None]
+        assert next == [None]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(next_url)
+
+        assert previous == [None]
+        assert current == [None]
+        assert next is None
+        assert next_url is None
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous == [3]
+        assert current == [None]
+        assert next == [None]
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous == [None]
+        assert current == [3]
+        assert next == [3]  # [4] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L731
+
+        # skip back artifact
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        (previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
+
+        assert previous is None
+        assert current == [4]
+        assert next == [3]
+
+
 def test_get_displayed_page_numbers():
     """
     Test our contextual page display function.
diff --git a/tests/test_relations.py b/tests/test_relations.py
index 7a4db1c48..b9ab15789 100644
--- a/tests/test_relations.py
+++ b/tests/test_relations.py
@@ -342,6 +342,142 @@ class TestSlugRelatedField(APISimpleTestCase):
         field.to_internal_value(self.instance.name)
 
 
+class TestNestedSlugRelatedField(APISimpleTestCase):
+    def setUp(self):
+        self.queryset = MockQueryset([
+            MockObject(
+                pk=1, name='foo', nested=MockObject(
+                    pk=2, name='bar', nested=MockObject(
+                        pk=7, name="foobar"
+                    )
+                )
+            ),
+            MockObject(
+                pk=3, name='hello', nested=MockObject(
+                    pk=4, name='world', nested=MockObject(
+                        pk=8, name="helloworld"
+                    )
+                )
+            ),
+            MockObject(
+                pk=5, name='harry', nested=MockObject(
+                    pk=6, name='potter', nested=MockObject(
+                        pk=9, name="harrypotter"
+                    )
+                )
+            )
+        ])
+        self.instance = self.queryset.items[2]
+        self.field = serializers.SlugRelatedField(
+            slug_field='name', queryset=self.queryset
+        )
+        self.nested_field = serializers.SlugRelatedField(
+            slug_field='nested__name', queryset=self.queryset
+        )
+
+        self.nested_nested_field = serializers.SlugRelatedField(
+            slug_field='nested__nested__name', queryset=self.queryset
+        )
+
+    # testing nested inside nested relations
+    def test_slug_related_nested_nested_lookup_exists(self):
+        instance = self.nested_nested_field.to_internal_value(
+            self.instance.nested.nested.name
+        )
+        assert instance is self.instance
+
+    def test_slug_related_nested_nested_lookup_does_not_exist(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.nested_nested_field.to_internal_value('doesnotexist')
+        msg = excinfo.value.detail[0]
+        assert msg == \
+            'Object with nested__nested__name=doesnotexist does not exist.'
+
+    def test_slug_related_nested_nested_lookup_invalid_type(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.nested_nested_field.to_internal_value(BadType())
+        msg = excinfo.value.detail[0]
+        assert msg == 'Invalid value.'
+
+    def test_nested_nested_representation(self):
+        representation =\
+            self.nested_nested_field.to_representation(self.instance)
+        assert representation == self.instance.nested.nested.name
+
+    def test_nested_nested_overriding_get_queryset(self):
+        qs = self.queryset
+
+        class NoQuerySetSlugRelatedField(serializers.SlugRelatedField):
+            def get_queryset(self):
+                return qs
+
+        field = NoQuerySetSlugRelatedField(slug_field='nested__nested__name')
+        field.to_internal_value(self.instance.nested.nested.name)
+
+    # testing nested relations
+    def test_slug_related_nested_lookup_exists(self):
+        instance = \
+            self.nested_field.to_internal_value(self.instance.nested.name)
+        assert instance is self.instance
+
+    def test_slug_related_nested_lookup_does_not_exist(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.nested_field.to_internal_value('doesnotexist')
+        msg = excinfo.value.detail[0]
+        assert msg == 'Object with nested__name=doesnotexist does not exist.'
+
+    def test_slug_related_nested_lookup_invalid_type(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.nested_field.to_internal_value(BadType())
+        msg = excinfo.value.detail[0]
+        assert msg == 'Invalid value.'
+
+    def test_nested_representation(self):
+        representation = self.nested_field.to_representation(self.instance)
+        assert representation == self.instance.nested.name
+
+    def test_nested_overriding_get_queryset(self):
+        qs = self.queryset
+
+        class NoQuerySetSlugRelatedField(serializers.SlugRelatedField):
+            def get_queryset(self):
+                return qs
+
+        field = NoQuerySetSlugRelatedField(slug_field='nested__name')
+        field.to_internal_value(self.instance.nested.name)
+
+    # testing non-nested relations
+    def test_slug_related_lookup_exists(self):
+        instance = self.field.to_internal_value(self.instance.name)
+        assert instance is self.instance
+
+    def test_slug_related_lookup_does_not_exist(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.field.to_internal_value('doesnotexist')
+        msg = excinfo.value.detail[0]
+        assert msg == 'Object with name=doesnotexist does not exist.'
+
+    def test_slug_related_lookup_invalid_type(self):
+        with pytest.raises(serializers.ValidationError) as excinfo:
+            self.field.to_internal_value(BadType())
+        msg = excinfo.value.detail[0]
+        assert msg == 'Invalid value.'
+
+    def test_representation(self):
+        representation = self.field.to_representation(self.instance)
+        assert representation == self.instance.name
+
+    def test_overriding_get_queryset(self):
+        qs = self.queryset
+
+        class NoQuerySetSlugRelatedField(serializers.SlugRelatedField):
+            def get_queryset(self):
+                return qs
+
+        field = NoQuerySetSlugRelatedField(slug_field='name')
+        field.to_internal_value(self.instance.name)
+
+
 class TestManyRelatedField(APISimpleTestCase):
     def setUp(self):
         self.instance = MockObject(pk=1, name='foo')
diff --git a/tests/test_renderers.py b/tests/test_renderers.py
index 8271608e1..247737576 100644
--- a/tests/test_renderers.py
+++ b/tests/test_renderers.py
@@ -1,5 +1,4 @@
 import re
-from collections import OrderedDict
 from collections.abc import MutableMapping
 
 import pytest
@@ -457,12 +456,12 @@ class CacheRenderTest(TestCase):
 class TestJSONIndentationStyles:
     def test_indented(self):
         renderer = JSONRenderer()
-        data = OrderedDict([('a', 1), ('b', 2)])
+        data = {"a": 1, "b": 2}
         assert renderer.render(data) == b'{"a":1,"b":2}'
 
     def test_compact(self):
         renderer = JSONRenderer()
-        data = OrderedDict([('a', 1), ('b', 2)])
+        data = {"a": 1, "b": 2}
         context = {'indent': 4}
         assert (
             renderer.render(data, renderer_context=context) ==
@@ -472,7 +471,7 @@ class TestJSONIndentationStyles:
     def test_long_form(self):
         renderer = JSONRenderer()
         renderer.compact = False
-        data = OrderedDict([('a', 1), ('b', 2)])
+        data = {"a": 1, "b": 2}
         assert renderer.render(data) == b'{"a": 1, "b": 2}'
 
 
@@ -634,6 +633,9 @@ class BrowsableAPIRendererTests(URLPatternsTestCase):
     class AuthExampleViewSet(ExampleViewSet):
         permission_classes = [permissions.IsAuthenticated]
 
+    class SimpleSerializer(serializers.Serializer):
+        name = serializers.CharField()
+
     router = SimpleRouter()
     router.register('examples', ExampleViewSet, basename='example')
     router.register('auth-examples', AuthExampleViewSet, basename='auth-example')
@@ -641,6 +643,62 @@ class BrowsableAPIRendererTests(URLPatternsTestCase):
 
     def setUp(self):
         self.renderer = BrowsableAPIRenderer()
+        self.renderer.accepted_media_type = ''
+        self.renderer.renderer_context = {}
+
+    def test_render_form_for_serializer(self):
+        with self.subTest('Serializer'):
+            serializer = BrowsableAPIRendererTests.SimpleSerializer(data={'name': 'Name'})
+            form = self.renderer.render_form_for_serializer(serializer)
+            assert isinstance(form, str), 'Must return form for serializer'
+
+        with self.subTest('ListSerializer'):
+            list_serializer = BrowsableAPIRendererTests.SimpleSerializer(data=[{'name': 'Name'}], many=True)
+            form = self.renderer.render_form_for_serializer(list_serializer)
+            assert form is None, 'Must not return form for list serializer'
+
+    def test_get_raw_data_form(self):
+        with self.subTest('Serializer'):
+            class DummyGenericViewsetLike(APIView):
+                def get_serializer(self, **kwargs):
+                    return BrowsableAPIRendererTests.SimpleSerializer(**kwargs)
+
+                def get(self, request):
+                    response = Response()
+                    response.view = self
+                    return response
+
+                post = get
+
+            view = DummyGenericViewsetLike.as_view()
+            _request = APIRequestFactory().get('/')
+            request = Request(_request)
+            response = view(_request)
+            view = response.view
+
+            raw_data_form = self.renderer.get_raw_data_form({'name': 'Name'}, view, 'POST', request)
+            assert raw_data_form['_content'].initial == '{\n    "name": ""\n}'
+
+        with self.subTest('ListSerializer'):
+            class DummyGenericViewsetLike(APIView):
+                def get_serializer(self, **kwargs):
+                    return BrowsableAPIRendererTests.SimpleSerializer(many=True, **kwargs)  # returns ListSerializer
+
+                def get(self, request):
+                    response = Response()
+                    response.view = self
+                    return response
+
+                post = get
+
+            view = DummyGenericViewsetLike.as_view()
+            _request = APIRequestFactory().get('/')
+            request = Request(_request)
+            response = view(_request)
+            view = response.view
+
+            raw_data_form = self.renderer.get_raw_data_form([{'name': 'Name'}], view, 'POST', request)
+            assert raw_data_form['_content'].initial == '[\n    {\n        "name": ""\n    }\n]'
 
     def test_get_description_returns_empty_string_for_401_and_403_statuses(self):
         assert self.renderer.get_description({}, status_code=401) == ''
diff --git a/tests/test_serializer.py b/tests/test_serializer.py
index 9934a0780..382900dea 100644
--- a/tests/test_serializer.py
+++ b/tests/test_serializer.py
@@ -2,6 +2,7 @@ import inspect
 import pickle
 import re
 import sys
+import unittest
 from collections import ChainMap
 from collections.abc import Mapping
 
@@ -764,3 +765,84 @@ class Test8301Regression:
 
         assert (s.data | {}).__class__ == s.data.__class__
         assert ({} | s.data).__class__ == s.data.__class__
+
+
+class TestSetValueMethod:
+    # Serializer.set_value() modifies the first parameter in-place.
+
+    s = serializers.Serializer()
+
+    def test_no_keys(self):
+        ret = {'a': 1}
+        self.s.set_value(ret, [], {'b': 2})
+        assert ret == {'a': 1, 'b': 2}
+
+    def test_one_key(self):
+        ret = {'a': 1}
+        self.s.set_value(ret, ['x'], 2)
+        assert ret == {'a': 1, 'x': 2}
+
+    def test_nested_key(self):
+        ret = {'a': 1}
+        self.s.set_value(ret, ['x', 'y'], 2)
+        assert ret == {'a': 1, 'x': {'y': 2}}
+
+
+class MyClass(models.Model):
+    name = models.CharField(max_length=100)
+    value = models.CharField(max_length=100, blank=True)
+
+    app_label = "test"
+
+    @property
+    def is_valid(self):
+        return self.name == 'valid'
+
+
+class MyClassSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MyClass
+        fields = ('id', 'name', 'value')
+
+    def validate_value(self, value):
+        if value and not self.instance.is_valid:
+            raise serializers.ValidationError(
+                'Status cannot be set for invalid instance')
+        return value
+
+
+class TestMultipleObjectsValidation(unittest.TestCase):
+    def setUp(self):
+        self.objs = [
+            MyClass(name='valid'),
+            MyClass(name='invalid'),
+            MyClass(name='other'),
+        ]
+
+    def test_multiple_objects_are_validated_separately(self):
+
+        serializer = MyClassSerializer(
+            data=[{'value': 'set', 'id': instance.id} for instance in
+                  self.objs],
+            instance=self.objs,
+            many=True,
+            partial=True,
+        )
+
+        assert not serializer.is_valid()
+        assert serializer.errors == [
+            {},
+            {'value': ['Status cannot be set for invalid instance']},
+            {'value': ['Status cannot be set for invalid instance']}
+        ]
+
+    def test_exception_raised_when_data_and_instance_length_different(self):
+
+        with self.assertRaises(AssertionError):
+            MyClassSerializer(
+                data=[{'value': 'set', 'id': instance.id} for instance in
+                      self.objs],
+                instance=self.objs[:-1],
+                many=True,
+                partial=True,
+            )
diff --git a/tests/test_validators.py b/tests/test_validators.py
index 35fef6f26..1cf42ed07 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -1,4 +1,5 @@
 import datetime
+from unittest.mock import MagicMock
 
 import pytest
 from django.db import DataError, models
@@ -787,3 +788,13 @@ class ValidatorsTests(TestCase):
             validator.filter_queryset(
                 attrs=None, queryset=None, field_name='', date_field_name=''
             )
+
+    def test_equality_operator(self):
+        mock_queryset = MagicMock()
+        validator = BaseUniqueForValidator(queryset=mock_queryset, field='foo',
+                                           date_field='bar')
+        validator2 = BaseUniqueForValidator(queryset=mock_queryset, field='foo',
+                                            date_field='bar')
+        assert validator == validator2
+        validator2.date_field = "bar2"
+        assert validator != validator2
diff --git a/tests/test_versioning.py b/tests/test_versioning.py
index 93f61d2be..1ccecae0b 100644
--- a/tests/test_versioning.py
+++ b/tests/test_versioning.py
@@ -152,6 +152,8 @@ class TestURLReversing(URLPatternsTestCase, APITestCase):
         path('v1/', include((included, 'v1'), namespace='v1')),
         path('another/', dummy_view, name='another'),
         re_path(r'^(?P<version>[v1|v2]+)/another/$', dummy_view, name='another'),
+        re_path(r'^(?P<foo>.+)/unversioned/$', dummy_view, name='unversioned'),
+
     ]
 
     def test_reverse_unversioned(self):
@@ -198,6 +200,14 @@ class TestURLReversing(URLPatternsTestCase, APITestCase):
         response = view(request)
         assert response.data == {'url': 'http://testserver/another/'}
 
+        # Test fallback when kwargs is not None
+        request = factory.get('/v1/endpoint/')
+        request.versioning_scheme = scheme()
+        request.version = 'v1'
+
+        reversed_url = reverse('unversioned', request=request, kwargs={'foo': 'bar'})
+        assert reversed_url == 'http://testserver/bar/unversioned/'
+
     def test_reverse_namespace_versioning(self):
         class FakeResolverMatch(ResolverMatch):
             namespace = 'v1'
@@ -262,7 +272,7 @@ class TestInvalidVersion:
         assert response.status_code == status.HTTP_404_NOT_FOUND
 
 
-class TestAllowedAndDefaultVersion:
+class TestAcceptHeaderAllowedAndDefaultVersion:
     def test_missing_without_default(self):
         scheme = versioning.AcceptHeaderVersioning
         view = AllowedVersionsView.as_view(versioning_class=scheme)
@@ -308,6 +318,97 @@ class TestAllowedAndDefaultVersion:
         assert response.data == {'version': 'v2'}
 
 
+class TestNamespaceAllowedAndDefaultVersion:
+    def test_no_namespace_without_default(self):
+        class FakeResolverMatch:
+            namespace = None
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_404_NOT_FOUND
+
+    def test_no_namespace_with_default(self):
+        class FakeResolverMatch:
+            namespace = None
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedAndDefaultVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {'version': 'v2'}
+
+    def test_no_match_without_default(self):
+        class FakeResolverMatch:
+            namespace = 'no_match'
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_404_NOT_FOUND
+
+    def test_no_match_with_default(self):
+        class FakeResolverMatch:
+            namespace = 'no_match'
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedAndDefaultVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {'version': 'v2'}
+
+    def test_with_default(self):
+        class FakeResolverMatch:
+            namespace = 'v1'
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedAndDefaultVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {'version': 'v1'}
+
+    def test_no_match_without_default_but_none_allowed(self):
+        class FakeResolverMatch:
+            namespace = 'no_match'
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedWithNoneVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {'version': None}
+
+    def test_no_match_with_default_and_none_allowed(self):
+        class FakeResolverMatch:
+            namespace = 'no_match'
+
+        scheme = versioning.NamespaceVersioning
+        view = AllowedWithNoneAndDefaultVersionsView.as_view(versioning_class=scheme)
+
+        request = factory.get('/endpoint/')
+        request.resolver_match = FakeResolverMatch
+        response = view(request)
+        assert response.status_code == status.HTTP_200_OK
+        assert response.data == {'version': 'v2'}
+
+
 class TestHyperlinkedRelatedField(URLPatternsTestCase, APITestCase):
     included = [
         path('namespaced/<int:pk>/', dummy_pk_view, name='namespaced'),
diff --git a/tests/test_viewsets.py b/tests/test_viewsets.py
index 8842b0b1c..8e439c86e 100644
--- a/tests/test_viewsets.py
+++ b/tests/test_viewsets.py
@@ -1,4 +1,3 @@
-from collections import OrderedDict
 from functools import wraps
 
 import pytest
@@ -261,11 +260,11 @@ class GetExtraActionUrlMapTests(TestCase):
         response = self.client.get('/api/actions/')
         view = response.view
 
-        expected = OrderedDict([
-            ('Custom list action', 'http://testserver/api/actions/custom_list_action/'),
-            ('List action', 'http://testserver/api/actions/list_action/'),
-            ('Wrapped list action', 'http://testserver/api/actions/wrapped_list_action/'),
-        ])
+        expected = {
+            'Custom list action': 'http://testserver/api/actions/custom_list_action/',
+            'List action': 'http://testserver/api/actions/list_action/',
+            'Wrapped list action': 'http://testserver/api/actions/wrapped_list_action/',
+        }
 
         self.assertEqual(view.get_extra_action_url_map(), expected)
 
@@ -273,28 +272,28 @@ class GetExtraActionUrlMapTests(TestCase):
         response = self.client.get('/api/actions/1/')
         view = response.view
 
-        expected = OrderedDict([
-            ('Custom detail action', 'http://testserver/api/actions/1/custom_detail_action/'),
-            ('Detail action', 'http://testserver/api/actions/1/detail_action/'),
-            ('Wrapped detail action', 'http://testserver/api/actions/1/wrapped_detail_action/'),
+        expected = {
+            'Custom detail action': 'http://testserver/api/actions/1/custom_detail_action/',
+            'Detail action': 'http://testserver/api/actions/1/detail_action/',
+            'Wrapped detail action': 'http://testserver/api/actions/1/wrapped_detail_action/',
             # "Unresolvable detail action" excluded, since it's not resolvable
-        ])
+        }
 
         self.assertEqual(view.get_extra_action_url_map(), expected)
 
     def test_uninitialized_view(self):
-        self.assertEqual(ActionViewSet().get_extra_action_url_map(), OrderedDict())
+        self.assertEqual(ActionViewSet().get_extra_action_url_map(), {})
 
     def test_action_names(self):
         # Action 'name' and 'suffix' kwargs should be respected
         response = self.client.get('/api/names/1/')
         view = response.view
 
-        expected = OrderedDict([
-            ('Custom Name', 'http://testserver/api/names/1/named_action/'),
-            ('Action Names Custom Suffix', 'http://testserver/api/names/1/suffixed_action/'),
-            ('Unnamed action', 'http://testserver/api/names/1/unnamed_action/'),
-        ])
+        expected = {
+            'Custom Name': 'http://testserver/api/names/1/named_action/',
+            'Action Names Custom Suffix': 'http://testserver/api/names/1/suffixed_action/',
+            'Unnamed action': 'http://testserver/api/names/1/unnamed_action/',
+        }
 
         self.assertEqual(view.get_extra_action_url_map(), expected)
 
diff --git a/tests/utils.py b/tests/utils.py
index 06e5b9abe..4ceb35309 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,3 +1,5 @@
+from operator import attrgetter
+
 from django.core.exceptions import ObjectDoesNotExist
 from django.urls import NoReverseMatch
 
@@ -26,7 +28,7 @@ class MockQueryset:
     def get(self, **lookup):
         for item in self.items:
             if all([
-                getattr(item, key, None) == value
+                attrgetter(key.replace('__', '.'))(item) == value
                 for key, value in lookup.items()
             ]):
                 return item
@@ -39,6 +41,7 @@ class BadType:
     will raise a `TypeError`, as occurs in Django when making
     queryset lookups with an incorrect type for the lookup value.
     """
+
     def __eq__(self):
         raise TypeError()
 
diff --git a/tox.ini b/tox.ini
index 7027612e0..2b8733d7d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -21,7 +21,7 @@ deps =
         django32: Django>=3.2,<4.0
         django40: Django>=4.0,<4.1
         django41: Django>=4.1,<4.2
-        django42: Django>=4.2b1,<5.0
+        django42: Django>=4.2,<5.0
         djangomain: https://github.com/django/django/archive/main.tar.gz
         -rrequirements/requirements-testing.txt
         -rrequirements/requirements-optionals.txt