diff --git a/.github/workflows/tests-and-linters.yml b/.github/workflows/tests-and-linters.yml
index a924c5e7..f43a2db8 100644
--- a/.github/workflows/tests-and-linters.yml
+++ b/.github/workflows/tests-and-linters.yml
@@ -4,28 +4,12 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
 
-  tests-on-legacy-versions:
-    name: Run tests on legacy versions
-    runs-on: ubuntu-20.04
-    strategy:
-      matrix:
-        python-version: [3.7]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-      - run: pip install tox
-      - run: tox
-        env:
-          TOXENV: ${{ matrix.python-version }}
-
   test-on-different-versions:
     name: Run tests
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10", 3.11, 3.12, 3.13]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
diff --git a/Makefile b/Makefile
index 84d0ef86..29e4086f 100644
--- a/Makefile
+++ b/Makefile
@@ -36,7 +36,7 @@ uninstall:
 test:
 	# Unit tests with coverage report
 	coverage erase
-	coverage run -m pytest -c tests/.configs/pytest.ini
+	coverage run -m pytest
 	coverage report
 	coverage html
 
diff --git a/pyproject.toml b/pyproject.toml
index eba17764..ec5daadd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ maintainers = [
 description = "Dependency injection framework for Python"
 readme = {file = "README.rst", content-type = "text/x-rst"}
 license = {file = "LICENSE.rst", content-type = "text/x-rst"}
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 keywords = [
     "Dependency injection",
     "DI",
@@ -31,7 +31,6 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
@@ -99,3 +98,17 @@ ignore = ["tests"]
 [tool.pylint.design]
 min-public-methods = 0
 max-public-methods = 30
+
+[tool.pytest.ini_options]
+testpaths = ["tests/unit/"]
+asyncio_mode = "auto"
+markers = [
+    "pydantic: Tests with Pydantic as a dependency",
+]
+filterwarnings = [
+    "ignore:Module \"dependency_injector.ext.aiohttp\" is deprecated since version 4\\.0\\.0:DeprecationWarning",
+    "ignore:Module \"dependency_injector.ext.flask\" is deprecated since version 4\\.0\\.0:DeprecationWarning",
+    "ignore:Please use \\`.*?\\` from the \\`scipy.*?\\`(.*?)namespace is deprecated\\.:DeprecationWarning",
+    "ignore:Please import \\`.*?\\` from the \\`scipy(.*?)\\` namespace(.*):DeprecationWarning",
+    "ignore:\\`scipy(.*?)\\` is deprecated(.*):DeprecationWarning",
+]
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0d759d4e..e0def494 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-cython==3.0.11
+cython==3.1.0
 setuptools
 pytest
 pytest-asyncio
diff --git a/setup.py b/setup.py
index 429e672c..877d9472 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,9 @@
 from setuptools import Extension, setup
 
 debug = os.environ.get("DEPENDENCY_INJECTOR_DEBUG_MODE") == "1"
+limited_api = os.environ.get("DEPENDENCY_INJECTOR_LIMITED_API") == "1"
 defined_macros = []
+options = {}
 compiler_directives = {
     "language_level": 3,
     "profile": debug,
@@ -17,6 +19,7 @@
 
 # Adding debug options:
 if debug:
+    limited_api = False  # line tracing is not part of the Limited API
     defined_macros.extend(
         [
             ("CYTHON_TRACE", "1"),
@@ -25,14 +28,20 @@
         ]
     )
 
+if limited_api:
+    options.setdefault("bdist_wheel", {})
+    options["bdist_wheel"]["py_limited_api"] = "cp38"
+    defined_macros.append(("Py_LIMITED_API", 0x03080000))
 
 setup(
+    options=options,
     ext_modules=cythonize(
         [
             Extension(
                 "*",
                 ["src/**/*.pyx"],
                 define_macros=defined_macros,
+                py_limited_api=limited_api,
             ),
         ],
         annotate=debug,
diff --git a/src/dependency_injector/providers.pyx b/src/dependency_injector/providers.pyx
index 73c5cbe1..d276903b 100644
--- a/src/dependency_injector/providers.pyx
+++ b/src/dependency_injector/providers.pyx
@@ -4,7 +4,6 @@ from __future__ import absolute_import
 
 import asyncio
 import builtins
-import contextvars
 import copy
 import errno
 import functools
@@ -17,6 +16,7 @@ import sys
 import threading
 import warnings
 from configparser import ConfigParser as IniConfigParser
+from contextvars import ContextVar
 
 try:
     from inspect import _is_coroutine_mark as _is_coroutine_marker
@@ -1592,8 +1592,7 @@ cdef class ConfigurationOption(Provider):
             segment() if is_provider(segment) else segment for segment in self._name
         )
 
-    @property
-    def root(self):
+    def _get_root(self):
         return self._root
 
     def get_name(self):
@@ -3224,15 +3223,10 @@ cdef class ContextLocalSingleton(BaseSingleton):
         :param provides: Provided type.
         :type provides: type
         """
-        if not contextvars:
-            raise RuntimeError(
-                "Contextvars library not found. This provider "
-                "requires Python 3.7 or a backport of contextvars. "
-                "To install a backport run \"pip install contextvars\"."
-            )
+
 
         super(ContextLocalSingleton, self).__init__(provides, *args, **kwargs)
-        self._storage = contextvars.ContextVar("_storage", default=self._none)
+        self._storage = ContextVar("_storage", default=self._none)
 
     def reset(self):
         """Reset cached instance, if any.
diff --git a/src/dependency_injector/wiring.py b/src/dependency_injector/wiring.py
index 9de6f823..1effd16f 100644
--- a/src/dependency_injector/wiring.py
+++ b/src/dependency_injector/wiring.py
@@ -314,7 +314,7 @@ def _resolve_config_option(
         original: providers.ConfigurationOption,
         as_: Any = None,
     ) -> Optional[providers.Provider]:
-        original_root = original.root
+        original_root = original._get_root()
         new = self._resolve_provider(original_root)
         if new is None:
             return None
@@ -523,6 +523,10 @@ def _patch_method(
 
     _bind_injections(fn, providers_map)
 
+    if fn is method:
+        # Hotfix, see: https://github.com/ets-labs/python-dependency-injector/issues/884
+        return
+
     if isinstance(method, (classmethod, staticmethod)):
         fn = type(method)(fn)
 
@@ -628,21 +632,6 @@ def _fetch_reference_injections(  # noqa: C901
     return injections, closing
 
 
-def _locate_dependent_closing_args(
-    provider: providers.Provider, closing_deps: Dict[str, providers.Provider]
-) -> Dict[str, providers.Provider]:
-    for arg in [
-        *getattr(provider, "args", []),
-        *getattr(provider, "kwargs", {}).values(),
-    ]:
-        if not isinstance(arg, providers.Provider):
-            continue
-        if isinstance(arg, providers.Resource):
-            closing_deps[str(id(arg))] = arg
-
-        _locate_dependent_closing_args(arg, closing_deps)
-
-
 def _bind_injections(fn: Callable[..., Any], providers_map: ProvidersMap) -> None:
     patched_callable = _patched_registry.get_callable(fn)
     if patched_callable is None:
@@ -664,10 +653,9 @@ def _bind_injections(fn: Callable[..., Any], providers_map: ProvidersMap) -> Non
 
         if injection in patched_callable.reference_closing:
             patched_callable.add_closing(injection, provider)
-            deps = {}
-            _locate_dependent_closing_args(provider, deps)
-            for key, dep in deps.items():
-                patched_callable.add_closing(key, dep)
+
+            for resource in provider.traverse(types=[providers.Resource]):
+                patched_callable.add_closing(str(id(resource)), resource)
 
 
 def _unbind_injections(fn: Callable[..., Any]) -> None:
diff --git a/tests/.configs/pytest.ini b/tests/.configs/pytest.ini
deleted file mode 100644
index ea92be96..00000000
--- a/tests/.configs/pytest.ini
+++ /dev/null
@@ -1,13 +0,0 @@
-[pytest]
-testpaths = tests/unit/
-python_files = test_*_py3*.py
-asyncio_mode = auto
-markers =
-    pydantic: Tests with Pydantic as a dependency
-filterwarnings =
-    ignore:Module \"dependency_injector.ext.aiohttp\" is deprecated since version 4\.0\.0:DeprecationWarning
-    ignore:Module \"dependency_injector.ext.flask\" is deprecated since version 4\.0\.0:DeprecationWarning
-    ignore:Please use \`.*?\` from the \`scipy.*?\`(.*?)namespace is deprecated\.:DeprecationWarning
-    ignore:Please import \`.*?\` from the \`scipy(.*?)\` namespace(.*):DeprecationWarning
-    ignore:\`scipy(.*?)\` is deprecated(.*):DeprecationWarning
-    ignore:ssl\.PROTOCOL_TLS is deprecated:DeprecationWarning:botocore.*
diff --git a/tests/unit/ext/test_flask_py2_py3.py b/tests/unit/ext/test_flask_py2_py3.py
index e64de165..3e79e067 100644
--- a/tests/unit/ext/test_flask_py2_py3.py
+++ b/tests/unit/ext/test_flask_py2_py3.py
@@ -11,7 +11,7 @@ def index():
     return "Hello World!"
 
 
-def test():
+def _test():
     return "Test!"
 
 
@@ -25,7 +25,7 @@ class ApplicationContainer(containers.DeclarativeContainer):
     app = flask.Application(Flask, __name__)
 
     index_view = flask.View(index)
-    test_view = flask.View(test)
+    test_view = flask.View(_test)
     test_class_view = flask.ClassBasedView(Test)
 
 
diff --git a/tests/unit/providers/resource/test_async_resource_py35.py b/tests/unit/providers/resource/test_async_resource_py35.py
index ba983d60..1ca950a8 100644
--- a/tests/unit/providers/resource/test_async_resource_py35.py
+++ b/tests/unit/providers/resource/test_async_resource_py35.py
@@ -34,7 +34,6 @@ async def _init():
 
 
 @mark.asyncio
-@mark.skipif(sys.version_info < (3, 6), reason="requires Python 3.6+")
 async def test_init_async_generator():
     resource = object()
 
diff --git a/tests/unit/samples/wiringstringids/resourceclosing.py b/tests/unit/samples/wiringstringids/resourceclosing.py
index c4d1f20f..5a3d2ba4 100644
--- a/tests/unit/samples/wiringstringids/resourceclosing.py
+++ b/tests/unit/samples/wiringstringids/resourceclosing.py
@@ -59,12 +59,13 @@ def init_service(counter: Counter, _list: List[int], _dict: Dict[str, int]):
 
 
 class Container(containers.DeclarativeContainer):
+    config = providers.Configuration(default={"a": 1, "b": 4})
     counter = providers.Singleton(Counter)
     _list = providers.List(
-        providers.Callable(lambda a: a, a=1), providers.Callable(lambda b: b, 2)
+        providers.Callable(lambda a: a, a=config.a), providers.Callable(lambda b: b, 2)
     )
     _dict = providers.Dict(
-        a=providers.Callable(lambda a: a, a=3), b=providers.Callable(lambda b: b, 4)
+        a=providers.Callable(lambda a: a, a=3), b=providers.Callable(lambda b: b, config.b)
     )
     service = providers.Resource(init_service, counter, _list, _dict=_dict)
     service2 = providers.Resource(init_service, counter, _list, _dict=_dict)
diff --git a/tests/unit/wiring/test_no_interference.py b/tests/unit/wiring/test_no_interference.py
new file mode 100644
index 00000000..21f8b0e9
--- /dev/null
+++ b/tests/unit/wiring/test_no_interference.py
@@ -0,0 +1,40 @@
+from typing import Any, Iterator
+
+from pytest import fixture
+
+from dependency_injector.containers import DeclarativeContainer
+from dependency_injector.providers import Object
+from dependency_injector.wiring import Provide, inject
+
+
+class A:
+    @inject
+    def foo(self, value: str = Provide["value"]) -> str:
+        return "A" + value
+
+
+class B(A): ...
+
+
+class C(A):
+    def foo(self, *args: Any, **kwargs: Any) -> str:
+        return "C" + super().foo()
+
+
+class D(B, C): ...
+
+
+class Container(DeclarativeContainer):
+    value = Object("X")
+
+
+@fixture
+def container() -> Iterator[Container]:
+    c = Container()
+    c.wire(modules=[__name__])
+    yield c
+    c.unwire()
+
+
+def test_preserve_mro(container: Container) -> None:
+    assert D().foo() == "CAX"
diff --git a/tox.ini b/tox.ini
index 54f99e57..29bc5a4f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 parallel_show_output = true
 envlist=
-    coveralls, pylint, flake8, pydocstyle, pydantic-v1, pydantic-v2, 3.7, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, pypy3.9, pypy3.10
+    coveralls, pylint, flake8, pydocstyle, pydantic-v1, pydantic-v2, 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, pypy3.9, pypy3.10
 
 [testenv]
 deps=
@@ -19,7 +19,7 @@ deps=
     werkzeug
 extras=
     yaml
-commands = pytest -c tests/.configs/pytest.ini
+commands = pytest
 python_files = test_*_py3*.py
 setenv =
     COVERAGE_RCFILE = pyproject.toml
@@ -45,7 +45,7 @@ deps =
     boto3
     mypy_boto3_s3
     werkzeug
-commands = pytest -c tests/.configs/pytest.ini -m pydantic
+commands = pytest -m pydantic
 
 [testenv:coveralls]
 passenv = GITHUB_*, COVERALLS_*, DEPENDENCY_INJECTOR_*
@@ -57,7 +57,7 @@ deps=
     coveralls>=4
 commands=
     coverage erase
-    coverage run -m pytest -c tests/.configs/pytest.ini
+    coverage run -m pytest
     coverage report
     coveralls
 
@@ -74,7 +74,7 @@ deps=
     mypy_boto3_s3
 extras=
     yaml
-commands = pytest -c tests/.configs/pytest-py35.ini
+commands = pytest
 
 
 [testenv:pylint]