diff --git a/requirements/requirements-codestyle.txt b/requirements/requirements-codestyle.txt
index 1a51179f8..8cbd41c50 100644
--- a/requirements/requirements-codestyle.txt
+++ b/requirements/requirements-codestyle.txt
@@ -4,4 +4,4 @@ flake8-tidy-imports==1.1.0
 pycodestyle==2.3.1
 
 # Sort and lint imports
-isort==4.2.15
+isort==4.3.3
diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index a336528e8..51b216787 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -11,8 +11,8 @@ import uuid
 from collections import OrderedDict
 
 from django.conf import settings
-from django.core.exceptions import ValidationError as DjangoValidationError
 from django.core.exceptions import ObjectDoesNotExist
+from django.core.exceptions import ValidationError as DjangoValidationError
 from django.core.validators import (
     EmailValidator, RegexValidator, URLValidator, ip_address_validators
 )
diff --git a/rest_framework/pagination.py b/rest_framework/pagination.py
index 861e8cf2a..4a74b6ed5 100644
--- a/rest_framework/pagination.py
+++ b/rest_framework/pagination.py
@@ -8,8 +8,8 @@ from __future__ import unicode_literals
 from base64 import b64decode, b64encode
 from collections import OrderedDict, namedtuple
 
-from django.core.paginator import Paginator as DjangoPaginator
 from django.core.paginator import InvalidPage
+from django.core.paginator import Paginator as DjangoPaginator
 from django.template import loader
 from django.utils import six
 from django.utils.encoding import force_text
diff --git a/rest_framework/parsers.py b/rest_framework/parsers.py
index d9dd5f252..35d0d1aa7 100644
--- a/rest_framework/parsers.py
+++ b/rest_framework/parsers.py
@@ -11,11 +11,10 @@ import codecs
 from django.conf import settings
 from django.core.files.uploadhandler import StopFutureHandlers
 from django.http import QueryDict
+from django.http.multipartparser import ChunkIter
 from django.http.multipartparser import \
     MultiPartParser as DjangoMultiPartParser
-from django.http.multipartparser import (
-    ChunkIter, MultiPartParserError, parse_header
-)
+from django.http.multipartparser import MultiPartParserError, parse_header
 from django.utils import six
 from django.utils.encoding import force_text
 from django.utils.six.moves.urllib import parse as urlparse
diff --git a/rest_framework/reverse.py b/rest_framework/reverse.py
index 54c463553..e9cf737f1 100644
--- a/rest_framework/reverse.py
+++ b/rest_framework/reverse.py
@@ -3,8 +3,8 @@ Provide urlresolver functions that return fully qualified URLs or view names
 """
 from __future__ import unicode_literals
 
-from django.urls import reverse as django_reverse
 from django.urls import NoReverseMatch
+from django.urls import reverse as django_reverse
 from django.utils import six
 from django.utils.functional import lazy
 
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 33da0bad0..0dce352e1 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -17,8 +17,8 @@ import inspect
 import traceback
 from collections import Mapping, OrderedDict
 
-from django.core.exceptions import ValidationError as DjangoValidationError
 from django.core.exceptions import ImproperlyConfigured
+from django.core.exceptions import ValidationError as DjangoValidationError
 from django.db import models
 from django.db.models import DurationField as ModelDurationField
 from django.db.models.fields import Field as DjangoModelField
diff --git a/rest_framework/test.py b/rest_framework/test.py
index c58df34c6..edacf0066 100644
--- a/rest_framework/test.py
+++ b/rest_framework/test.py
@@ -12,8 +12,8 @@ from django.core.exceptions import ImproperlyConfigured
 from django.core.handlers.wsgi import WSGIHandler
 from django.test import override_settings, testcases
 from django.test.client import Client as DjangoClient
-from django.test.client import RequestFactory as DjangoRequestFactory
 from django.test.client import ClientHandler
+from django.test.client import RequestFactory as DjangoRequestFactory
 from django.utils import six
 from django.utils.encoding import force_bytes
 from django.utils.http import urlencode
diff --git a/tests/test_description.py b/tests/test_description.py
index 6ccbec882..ffd2636f2 100644
--- a/tests/test_description.py
+++ b/tests/test_description.py
@@ -9,7 +9,6 @@ from rest_framework.compat import apply_markdown
 from rest_framework.utils.formatting import dedent
 from rest_framework.views import APIView
 
-
 # We check that docstrings get nicely un-indented.
 DESCRIPTION = """an example docstring
 ====================