diff --git a/pkg_resources/__init__.py b/pkg_resources/__init__.py
index 8a2fbfa412..7ad39c3956 100644
--- a/pkg_resources/__init__.py
+++ b/pkg_resources/__init__.py
@@ -93,7 +93,7 @@
 if TYPE_CHECKING:
     from _typeshed import BytesPath, StrOrBytesPath, StrPath
     from _typeshed.importlib import LoaderProtocol
-    from typing_extensions import Self, TypeAlias
+    from typing_extensions import Never, Self, TypeAlias
 
 warnings.warn(
     "pkg_resources is deprecated as an API. "
@@ -2370,7 +2370,7 @@ class NoDists:
     def __bool__(self) -> Literal[False]:
         return False
 
-    def __call__(self, fullpath: object):
+    def __call__(self, fullpath: object) -> Iterator[Never]:
         return iter(())
 
 
@@ -3168,13 +3168,13 @@ def __str__(self) -> str:
         version = version or "[unknown version]"
         return f"{self.project_name} {version}"
 
-    def __getattr__(self, attr: str):
+    def __getattr__(self, attr: str) -> Any:
         """Delegate all unrecognized public attributes to .metadata provider"""
         if attr.startswith('_'):
             raise AttributeError(attr)
         return getattr(self._provider, attr)
 
-    def __dir__(self):
+    def __dir__(self) -> list[str]:
         return list(
             set(super().__dir__())
             | set(attr for attr in self._provider.__dir__() if not attr.startswith('_'))
diff --git a/pkg_resources/tests/test_pkg_resources.py b/pkg_resources/tests/test_pkg_resources.py
index cfc9b16c0f..770ce527c9 100644
--- a/pkg_resources/tests/test_pkg_resources.py
+++ b/pkg_resources/tests/test_pkg_resources.py
@@ -22,7 +22,7 @@
 
 
 class EggRemover(str):
-    def __call__(self):
+    def __call__(self) -> None:
         if self in sys.path:
             sys.path.remove(self)
         if os.path.exists(self):
diff --git a/pkg_resources/tests/test_working_set.py b/pkg_resources/tests/test_working_set.py
index ed20c59dd3..8b18ea56fd 100644
--- a/pkg_resources/tests/test_working_set.py
+++ b/pkg_resources/tests/test_working_set.py
@@ -1,7 +1,10 @@
+from __future__ import annotations
+
 import functools
 import inspect
 import re
 import textwrap
+from collections.abc import Iterable
 
 import pytest
 
@@ -56,10 +59,10 @@ def parse_distributions(s):
 
 
 class FakeInstaller:
-    def __init__(self, installable_dists) -> None:
+    def __init__(self, installable_dists: Iterable[pkg_resources.Distribution]) -> None:
         self._installable_dists = installable_dists
 
-    def __call__(self, req):
+    def __call__(self, req) -> pkg_resources.Distribution | None:
         return next(
             iter(filter(lambda dist: dist in req, self._installable_dists)), None
         )
diff --git a/ruff.toml b/ruff.toml
index 349d22cebd..56ca159dd9 100644
--- a/ruff.toml
+++ b/ruff.toml
@@ -65,7 +65,6 @@ ignore = [
 	"UP038", # Using `X | Y` in `isinstance` call is slower and more verbose https://github.com/astral-sh/ruff/issues/7871
 	# Only enforcing return type annotations for public functions
 	"ANN202", # missing-return-type-private-function
-	"ANN204", # missing-return-type-special-method
 ]
 
 [lint.per-file-ignores]
diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index 2f6fcb7cdc..4a3d0e7df8 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -9,6 +9,7 @@
 from functools import partial
 from glob import glob
 from pathlib import Path
+from typing import Any
 
 from more_itertools import unique_everseen
 
@@ -81,7 +82,8 @@ def run(self) -> None:
         # output files are.
         self.byte_compile(orig.build_py.get_outputs(self, include_bytecode=False))
 
-    def __getattr__(self, attr: str):
+    # Should return "list[tuple[str, str, str, list[str]]] | Any" but can't do without typed distutils on Python 3.12+
+    def __getattr__(self, attr: str) -> Any:
         "lazily compute data files"
         if attr == 'data_files':
             self.data_files = self._get_data_files()
@@ -381,8 +383,8 @@ class _Warning(SetuptoolsDeprecationWarning):
         # _DUE_DATE: still not defined as this is particularly controversial.
         # Warning initially introduced in May 2022. See issue #3340 for discussion.
 
-    def __init__(self):
-        self._already_warned = set()
+    def __init__(self) -> None:
+        self._already_warned = set[str]()
 
     def is_module(self, file):
         return file.endswith(".py") and file[: -len(".py")].isidentifier()
diff --git a/setuptools/command/editable_wheel.py b/setuptools/command/editable_wheel.py
index 917d5f149b..2f733106d7 100644
--- a/setuptools/command/editable_wheel.py
+++ b/setuptools/command/editable_wheel.py
@@ -402,7 +402,9 @@ def __init__(self, dist: Distribution, name: str, path_entries: list[Path]) -> N
         self.name = name
         self.path_entries = path_entries
 
-    def __call__(self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]):
+    def __call__(
+        self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]
+    ) -> None:
         entries = "\n".join(str(p.resolve()) for p in self.path_entries)
         contents = _encode_pth(f"{entries}\n")
         wheel.writestr(f"__editable__.{self.name}.pth", contents)
@@ -447,7 +449,9 @@ def __init__(
         self._file = dist.get_command_obj("build_py").copy_file
         super().__init__(dist, name, [self.auxiliary_dir])
 
-    def __call__(self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]):
+    def __call__(
+        self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]
+    ) -> None:
         self._create_links(files, mapping)
         super().__call__(wheel, files, mapping)
 
@@ -541,7 +545,9 @@ def get_implementation(self) -> Iterator[tuple[str, bytes]]:
         content = _encode_pth(f"import {finder}; {finder}.install()")
         yield (f"__editable__.{self.name}.pth", content)
 
-    def __call__(self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]):
+    def __call__(
+        self, wheel: WheelFile, files: list[str], mapping: Mapping[str, str]
+    ) -> None:
         for file, content in self.get_implementation():
             wheel.writestr(file, content)
 
diff --git a/setuptools/config/expand.py b/setuptools/config/expand.py
index 531f965013..d9a2ded430 100644
--- a/setuptools/config/expand.py
+++ b/setuptools/config/expand.py
@@ -65,7 +65,7 @@ def _find_assignments(self) -> Iterator[tuple[ast.AST, ast.AST]]:
             elif isinstance(statement, ast.AnnAssign) and statement.value:
                 yield (statement.target, statement.value)
 
-    def __getattr__(self, attr: str):
+    def __getattr__(self, attr: str) -> Any:
         """Attempt to load an attribute "statically", via :func:`ast.literal_eval`."""
         try:
             return next(
@@ -390,7 +390,7 @@ def __init__(self, distribution: Distribution) -> None:
         self._dist = distribution
         self._called = False
 
-    def __call__(self):
+    def __call__(self) -> None:
         """Trigger the automatic package discovery, if it is still necessary."""
         if not self._called:
             self._called = True
@@ -404,7 +404,7 @@ def __exit__(
         exc_type: type[BaseException] | None,
         exc_value: BaseException | None,
         traceback: TracebackType | None,
-    ):
+    ) -> None:
         if self._called:
             self._dist.set_defaults.analyse_name()  # Now we can set a default name
 
diff --git a/setuptools/discovery.py b/setuptools/discovery.py
index c888399185..606796c388 100644
--- a/setuptools/discovery.py
+++ b/setuptools/discovery.py
@@ -335,7 +335,7 @@ def _package_dir(self) -> dict[str, str]:
 
     def __call__(
         self, force: bool = False, name: bool = True, ignore_ext_modules: bool = False
-    ):
+    ) -> None:
         """Automatically discover missing configuration fields
         and modifies the given ``distribution`` object in-place.
 
diff --git a/setuptools/tests/integration/helpers.py b/setuptools/tests/integration/helpers.py
index 77b196e029..465ff72fc2 100644
--- a/setuptools/tests/integration/helpers.py
+++ b/setuptools/tests/integration/helpers.py
@@ -5,11 +5,14 @@
 facilitate debugging.
 """
 
+from __future__ import annotations
+
 import os
 import subprocess
 import tarfile
+from collections.abc import Iterator
 from pathlib import Path
-from zipfile import ZipFile
+from zipfile import ZipFile, ZipInfo
 
 
 def run(cmd, env=None):
@@ -35,7 +38,7 @@ def run(cmd, env=None):
 class Archive:
     """Compatibility layer for ZipFile/Info and TarFile/Info"""
 
-    def __init__(self, filename):
+    def __init__(self, filename) -> None:
         self._filename = filename
         if filename.endswith("tar.gz"):
             self._obj = tarfile.open(filename, "r:gz")
@@ -44,7 +47,7 @@ def __init__(self, filename):
         else:
             raise ValueError(f"{filename} doesn't seem to be a zip or tar.gz")
 
-    def __iter__(self):
+    def __iter__(self) -> Iterator[ZipInfo] | Iterator[tarfile.TarInfo]:
         if hasattr(self._obj, "infolist"):
             return iter(self._obj.infolist())
         return iter(self._obj)
diff --git a/setuptools/tests/test_bdist_wheel.py b/setuptools/tests/test_bdist_wheel.py
index 2ab4e9cfc6..68cc0c4d36 100644
--- a/setuptools/tests/test_bdist_wheel.py
+++ b/setuptools/tests/test_bdist_wheel.py
@@ -295,7 +295,7 @@ def test_preserve_unicode_metadata(monkeypatch, tmp_path):
     class simpler_bdist_wheel(bdist_wheel):
         """Avoid messing with setuptools/distutils internals"""
 
-        def __init__(self):
+        def __init__(self) -> None:
             pass
 
         @property
diff --git a/setuptools/tests/test_build_meta.py b/setuptools/tests/test_build_meta.py
index 57162fd6af..2cd0a0a8ed 100644
--- a/setuptools/tests/test_build_meta.py
+++ b/setuptools/tests/test_build_meta.py
@@ -35,7 +35,7 @@
 
 
 class BuildBackendBase:
-    def __init__(self, cwd='.', env=None, backend_name='setuptools.build_meta'):
+    def __init__(self, cwd='.', env=None, backend_name='setuptools.build_meta') -> None:
         self.cwd = cwd
         self.env = env or {}
         self.backend_name = backend_name
@@ -44,7 +44,7 @@ def __init__(self, cwd='.', env=None, backend_name='setuptools.build_meta'):
 class BuildBackend(BuildBackendBase):
     """PEP 517 Build Backend"""
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
         self.pool = futures.ProcessPoolExecutor(max_workers=1)
 
@@ -77,12 +77,12 @@ def _kill(self, pid):
 
 
 class BuildBackendCaller(BuildBackendBase):
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
         (self.backend_name, _, self.backend_obj) = self.backend_name.partition(':')
 
-    def __call__(self, name, *args, **kw):
+    def __call__(self, name, *args, **kw) -> Any:
         """Handles arbitrary function invocations on the build backend."""
         os.chdir(self.cwd)
         os.environ.update(self.env)
diff --git a/setuptools/tests/test_wheel.py b/setuptools/tests/test_wheel.py
index 70165c608b..97e6ed8595 100644
--- a/setuptools/tests/test_wheel.py
+++ b/setuptools/tests/test_wheel.py
@@ -171,7 +171,7 @@ def _check_wheel_install(
 
 
 class Record:
-    def __init__(self, id, **kwargs):
+    def __init__(self, id, **kwargs) -> None:
         self._id = id
         self._fields = kwargs