diff --git a/docs/wiring.rst b/docs/wiring.rst
index 2de708d0..74026879 100644
--- a/docs/wiring.rst
+++ b/docs/wiring.rst
@@ -64,7 +64,7 @@ FastAPI example:
 
    @app.api_route("/")
    @inject
-   async def index(service: Service = Depends(Provide[Container.service])):
+   async def index(service: Annotated[Service, Depends(Provide[Container.service])]):
        value = await service.process()
        return {"result": value}
 
diff --git a/examples/miniapps/fastapi-redis/fastapiredis/application.py b/examples/miniapps/fastapi-redis/fastapiredis/application.py
index f8e4a3bb..52f14366 100644
--- a/examples/miniapps/fastapi-redis/fastapiredis/application.py
+++ b/examples/miniapps/fastapi-redis/fastapiredis/application.py
@@ -1,18 +1,22 @@
 """Application module."""
 
-from dependency_injector.wiring import inject, Provide
-from fastapi import FastAPI, Depends
+from typing import Annotated
+
+from fastapi import Depends, FastAPI
+
+from dependency_injector.wiring import Provide, inject
 
 from .containers import Container
 from .services import Service
 
-
 app = FastAPI()
 
 
 @app.api_route("/")
 @inject
-async def index(service: Service = Depends(Provide[Container.service])):
+async def index(
+    service: Annotated[Service, Depends(Provide[Container.service])]
+) -> dict[str, str]:
     value = await service.process()
     return {"result": value}
 
diff --git a/examples/miniapps/fastapi-simple/fastapi_di_example.py b/examples/miniapps/fastapi-simple/fastapi_di_example.py
index 9f3d3f83..6d50499c 100644
--- a/examples/miniapps/fastapi-simple/fastapi_di_example.py
+++ b/examples/miniapps/fastapi-simple/fastapi_di_example.py
@@ -1,4 +1,7 @@
-from fastapi import FastAPI, Depends
+from typing import Annotated
+
+from fastapi import Depends, FastAPI
+
 from dependency_injector import containers, providers
 from dependency_injector.wiring import Provide, inject
 
@@ -18,7 +21,9 @@ app = FastAPI()
 
 @app.api_route("/")
 @inject
-async def index(service: Service = Depends(Provide[Container.service])):
+async def index(
+    service: Annotated[Service, Depends(Provide[Container.service])]
+) -> dict[str, str]:
     result = await service.process()
     return {"result": result}
 
diff --git a/examples/miniapps/fastapi-sqlalchemy/webapp/endpoints.py b/examples/miniapps/fastapi-sqlalchemy/webapp/endpoints.py
index 4d27101e..e02c2740 100644
--- a/examples/miniapps/fastapi-sqlalchemy/webapp/endpoints.py
+++ b/examples/miniapps/fastapi-sqlalchemy/webapp/endpoints.py
@@ -1,11 +1,14 @@
 """Endpoints module."""
 
+from typing import Annotated
+
 from fastapi import APIRouter, Depends, Response, status
-from dependency_injector.wiring import inject, Provide
+
+from dependency_injector.wiring import Provide, inject
 
 from .containers import Container
-from .services import UserService
 from .repositories import NotFoundError
+from .services import UserService
 
 router = APIRouter()
 
@@ -13,7 +16,7 @@ router = APIRouter()
 @router.get("/users")
 @inject
 def get_list(
-        user_service: UserService = Depends(Provide[Container.user_service]),
+    user_service: Annotated[UserService, Depends(Provide[Container.user_service])],
 ):
     return user_service.get_users()
 
@@ -21,8 +24,8 @@ def get_list(
 @router.get("/users/{user_id}")
 @inject
 def get_by_id(
-        user_id: int,
-        user_service: UserService = Depends(Provide[Container.user_service]),
+    user_id: int,
+    user_service: Annotated[UserService, Depends(Provide[Container.user_service])],
 ):
     try:
         return user_service.get_user_by_id(user_id)
@@ -33,7 +36,7 @@ def get_by_id(
 @router.post("/users", status_code=status.HTTP_201_CREATED)
 @inject
 def add(
-        user_service: UserService = Depends(Provide[Container.user_service]),
+    user_service: Annotated[UserService, Depends(Provide[Container.user_service])],
 ):
     return user_service.create_user()
 
@@ -41,9 +44,9 @@ def add(
 @router.delete("/users/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
 @inject
 def remove(
-        user_id: int,
-        user_service: UserService = Depends(Provide[Container.user_service]),
-):
+    user_id: int,
+    user_service: Annotated[UserService, Depends(Provide[Container.user_service])],
+) -> Response:
     try:
         user_service.delete_user_by_id(user_id)
     except NotFoundError:
diff --git a/examples/miniapps/fastapi/giphynavigator/endpoints.py b/examples/miniapps/fastapi/giphynavigator/endpoints.py
index 2761f203..904eb71d 100644
--- a/examples/miniapps/fastapi/giphynavigator/endpoints.py
+++ b/examples/miniapps/fastapi/giphynavigator/endpoints.py
@@ -1,13 +1,14 @@
 """Endpoints module."""
 
-from typing import Optional, List
+from typing import Annotated, List
 
 from fastapi import APIRouter, Depends
 from pydantic import BaseModel
-from dependency_injector.wiring import inject, Provide
 
-from .services import SearchService
+from dependency_injector.wiring import Provide, inject
+
 from .containers import Container
+from .services import SearchService
 
 
 class Gif(BaseModel):
@@ -26,11 +27,15 @@ router = APIRouter()
 @router.get("/", response_model=Response)
 @inject
 async def index(
-        query: Optional[str] = None,
-        limit: Optional[str] = None,
-        default_query: str = Depends(Provide[Container.config.default.query]),
-        default_limit: int = Depends(Provide[Container.config.default.limit.as_int()]),
-        search_service: SearchService = Depends(Provide[Container.search_service]),
+    default_query: Annotated[str, Depends(Provide[Container.config.default.query])],
+    default_limit: Annotated[
+        int, Depends(Provide[Container.config.default.limit.as_int()])
+    ],
+    search_service: Annotated[
+        SearchService, Depends(Provide[Container.search_service])
+    ],
+    query: str | None = None,
+    limit: int | None = None,
 ):
     query = query or default_query
     limit = limit or default_limit
diff --git a/src/dependency_injector/_cwiring.pyx b/src/dependency_injector/_cwiring.pyx
index 88b6bc5a..84a5485f 100644
--- a/src/dependency_injector/_cwiring.pyx
+++ b/src/dependency_injector/_cwiring.pyx
@@ -2,44 +2,39 @@
 
 import asyncio
 import collections.abc
-import functools
 import inspect
 import types
 
-from . import providers
-from .wiring import _Marker, PatchedCallable
+from .wiring import _Marker
 
-from .providers cimport Provider
+from .providers cimport Provider, Resource
 
 
-def _get_sync_patched(fn, patched: PatchedCallable):
-    @functools.wraps(fn)
-    def _patched(*args, **kwargs):
-        cdef object result
-        cdef dict to_inject
-        cdef object arg_key
-        cdef Provider provider
+def _sync_inject(object fn, tuple args, dict kwargs, dict injections, dict closings, /):
+    cdef object result
+    cdef dict to_inject
+    cdef object arg_key
+    cdef Provider provider
 
-        to_inject = kwargs.copy()
-        for arg_key, provider in patched.injections.items():
-            if arg_key not in kwargs or isinstance(kwargs[arg_key], _Marker):
-                to_inject[arg_key] = provider()
+    to_inject = kwargs.copy()
+    for arg_key, provider in injections.items():
+        if arg_key not in kwargs or isinstance(kwargs[arg_key], _Marker):
+            to_inject[arg_key] = provider()
 
-        result = fn(*args, **to_inject)
+    result = fn(*args, **to_inject)
 
-        if patched.closing:
-            for arg_key, provider in patched.closing.items():
-                if arg_key in kwargs and not isinstance(kwargs[arg_key], _Marker):
-                    continue
-                if not isinstance(provider, providers.Resource):
-                    continue
-                provider.shutdown()
+    if closings:
+        for arg_key, provider in closings.items():
+            if arg_key in kwargs and not isinstance(kwargs[arg_key], _Marker):
+                continue
+            if not isinstance(provider, Resource):
+                continue
+            provider.shutdown()
 
-        return result
-    return _patched
+    return result
 
 
-async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dict closings):
+async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dict closings, /):
     cdef object result
     cdef dict to_inject
     cdef list to_inject_await = []
@@ -69,7 +64,7 @@ async def _async_inject(object fn, tuple args, dict kwargs, dict injections, dic
         for arg_key, provider in closings.items():
             if arg_key in kwargs and isinstance(kwargs[arg_key], _Marker):
                 continue
-            if not isinstance(provider, providers.Resource):
+            if not isinstance(provider, Resource):
                 continue
             shutdown = provider.shutdown()
             if _isawaitable(shutdown):
diff --git a/src/dependency_injector/providers.pyx b/src/dependency_injector/providers.pyx
index 39716ea0..71b048a1 100644
--- a/src/dependency_injector/providers.pyx
+++ b/src/dependency_injector/providers.pyx
@@ -2,6 +2,7 @@
 
 from __future__ import absolute_import
 
+import asyncio
 import copy
 import errno
 import functools
@@ -27,17 +28,19 @@ except ImportError:
     import __builtin__ as builtins
 
 try:
-    import asyncio
+    from inspect import _is_coroutine_mark as _is_coroutine_marker
 except ImportError:
-    asyncio = None
-    _is_coroutine_marker = None
-else:
-    if sys.version_info >= (3, 5, 3):
-        import asyncio.coroutines
-        _is_coroutine_marker = asyncio.coroutines._is_coroutine
-    else:
+    try:
+        # Python >=3.12.0,<3.12.5
+        from inspect import _is_coroutine_marker
+    except ImportError:
         _is_coroutine_marker = True
 
+try:
+    from asyncio.coroutines import _is_coroutine
+except ImportError:
+    _is_coroutine = True
+
 try:
     import ConfigParser as iniconfigparser
 except ImportError:
@@ -1475,7 +1478,8 @@ cdef class Coroutine(Callable):
         some_coroutine.add_kwargs(keyword_argument1=3, keyword_argument=4)
     """
 
-    _is_coroutine = _is_coroutine_marker
+    _is_coroutine_marker = _is_coroutine_marker  # Python >=3.12
+    _is_coroutine = _is_coroutine  # Python <3.16
 
     def set_provides(self, provides):
         """Set provider provides."""
diff --git a/src/dependency_injector/wiring.py b/src/dependency_injector/wiring.py
index 69b62c05..5cded9f5 100644
--- a/src/dependency_injector/wiring.py
+++ b/src/dependency_injector/wiring.py
@@ -1028,8 +1028,8 @@ _inspect_filter = InspectFilter()
 _loader = AutoLoader()
 
 # Optimizations
+from ._cwiring import _sync_inject  # noqa
 from ._cwiring import _async_inject  # noqa
-from ._cwiring import _get_sync_patched  # noqa
 
 
 # Wiring uses the following Python wrapper because there is
@@ -1045,4 +1045,17 @@ def _get_async_patched(fn: F, patched: PatchedCallable) -> F:
             patched.closing,
         )
 
-    return _patched
+    return cast(F, _patched)
+
+
+def _get_sync_patched(fn: F, patched: PatchedCallable) -> F:
+    @functools.wraps(fn)
+    def _patched(*args, **kwargs):
+        return _sync_inject(
+            fn,
+            args,
+            kwargs,
+            patched.injections,
+            patched.closing,
+        )
+    return cast(F, _patched)
diff --git a/tests/unit/providers/coroutines/test_coroutine_py35.py b/tests/unit/providers/coroutines/test_coroutine_py35.py
index 22e794b1..de0e9c67 100644
--- a/tests/unit/providers/coroutines/test_coroutine_py35.py
+++ b/tests/unit/providers/coroutines/test_coroutine_py35.py
@@ -1,4 +1,5 @@
 """Coroutine provider tests."""
+import sys
 
 from dependency_injector import providers, errors
 from pytest import mark, raises
@@ -208,3 +209,17 @@ def test_repr():
         "<dependency_injector.providers."
         "Coroutine({0}) at {1}>".format(repr(example), hex(id(provider)))
     )
+
+
+@mark.skipif(sys.version_info > (3, 15), reason="requires Python<3.16")
+def test_asyncio_iscoroutinefunction() -> None:
+    from asyncio.coroutines import iscoroutinefunction
+
+    assert iscoroutinefunction(providers.Coroutine(example))
+
+
+@mark.skipif(sys.version_info < (3, 12), reason="requires Python>=3.12")
+def test_inspect_iscoroutinefunction() -> None:
+    from inspect import iscoroutinefunction
+
+    assert iscoroutinefunction(providers.Coroutine(example))
diff --git a/tests/unit/wiring/test_introspection_py36.py b/tests/unit/wiring/test_introspection_py36.py
index c7149602..66b36a80 100644
--- a/tests/unit/wiring/test_introspection_py36.py
+++ b/tests/unit/wiring/test_introspection_py36.py
@@ -6,6 +6,13 @@ import inspect
 from dependency_injector.wiring import inject
 
 
+def test_isfunction():
+    @inject
+    def foo(): ...
+
+    assert inspect.isfunction(foo)
+
+
 def test_asyncio_iscoroutinefunction():
     @inject
     async def foo():