diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 54cc8303..2768473a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,6 @@
 repos:
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.12.0
+  rev: v0.15.12
   hooks:
   - id: ruff-check
     args: [--fix, --unsafe-fixes]
diff --git a/conftest.py b/conftest.py
index 578b7aac..cf0327a0 100644
--- a/conftest.py
+++ b/conftest.py
@@ -48,7 +48,7 @@ def _save_cwd():
 
 @pytest.fixture
 def distutils_managed_tempdir(request):
-    from distutils.tests.compat import py39 as os_helper
+    from test.support import os_helper
 
     self = request.instance
     self.tempdirs = []
diff --git a/distutils/_modified.py b/distutils/_modified.py
index f7d2b77c..4033c079 100644
--- a/distutils/_modified.py
+++ b/distutils/_modified.py
@@ -9,7 +9,6 @@
 
 from jaraco.functools import splat
 
-from .compat.py39 import zip_strict
 from .errors import DistutilsFileError
 
 _SourcesT = TypeVar(
@@ -57,7 +56,7 @@ def newer_pairwise(
     targets) where source is newer than target, according to the semantics
     of 'newer()'.
     """
-    newer_pairs = filter(splat(newer), zip_strict(sources, targets))
+    newer_pairs = filter(splat(newer), zip(sources, targets, strict=True))
     return tuple(map(list, zip(*newer_pairs, strict=False))) or ([], [])
 
 
diff --git a/distutils/compat/py39.py b/distutils/compat/py39.py
deleted file mode 100644
index 9fe2c625..00000000
--- a/distutils/compat/py39.py
+++ /dev/null
@@ -1,66 +0,0 @@
-import functools
-import itertools
-import platform
-import sys
-
-
-def add_ext_suffix_39(vars):
-    """
-    Ensure vars contains 'EXT_SUFFIX'. pypa/distutils#130
-    """
-    import _imp
-
-    ext_suffix = _imp.extension_suffixes()[0]
-    vars.update(
-        EXT_SUFFIX=ext_suffix,
-        # sysconfig sets SO to match EXT_SUFFIX, so maintain
-        # that expectation.
-        # https://github.com/python/cpython/blob/785cc6770588de087d09e89a69110af2542be208/Lib/sysconfig.py#L671-L673
-        SO=ext_suffix,
-    )
-
-
-needs_ext_suffix = sys.version_info < (3, 10) and platform.system() == 'Windows'
-add_ext_suffix = add_ext_suffix_39 if needs_ext_suffix else lambda vars: None
-
-
-# from more_itertools
-class UnequalIterablesError(ValueError):
-    def __init__(self, details=None):
-        msg = 'Iterables have different lengths'
-        if details is not None:
-            msg += (': index 0 has length {}; index {} has length {}').format(*details)
-
-        super().__init__(msg)
-
-
-# from more_itertools
-def _zip_equal_generator(iterables):
-    _marker = object()
-    for combo in itertools.zip_longest(*iterables, fillvalue=_marker):
-        for val in combo:
-            if val is _marker:
-                raise UnequalIterablesError()
-        yield combo
-
-
-# from more_itertools
-def _zip_equal(*iterables):
-    # Check whether the iterables are all the same size.
-    try:
-        first_size = len(iterables[0])
-        for i, it in enumerate(iterables[1:], 1):
-            size = len(it)
-            if size != first_size:
-                raise UnequalIterablesError(details=(first_size, i, size))
-        # All sizes are equal, we can use the built-in zip.
-        return zip(*iterables, strict=False)
-    # If any one of the iterables didn't have a length, start reading
-    # them until one runs out.
-    except TypeError:
-        return _zip_equal_generator(iterables)
-
-
-zip_strict = (
-    _zip_equal if sys.version_info < (3, 10) else functools.partial(zip, strict=True)
-)
diff --git a/distutils/compilers/C/tests/test_unix.py b/distutils/compilers/C/tests/test_unix.py
index 35b6b0e0..0352a83d 100644
--- a/distutils/compilers/C/tests/test_unix.py
+++ b/distutils/compilers/C/tests/test_unix.py
@@ -7,10 +7,10 @@
 from distutils.compat import consolidate_linker_args
 from distutils.errors import DistutilsPlatformError
 from distutils.tests import support
-from distutils.tests.compat.py39 import EnvironmentVarGuard
 from distutils.util import _clear_cached_macosx_ver
 
 import pytest
+from test.support import os_helper
 
 from .. import unix
 
@@ -238,7 +238,7 @@ def gcvs(*args, _orig=sysconfig.get_config_vars):
 
         sysconfig.get_config_var = gcv
         sysconfig.get_config_vars = gcvs
-        with EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env['CC'] = 'my_cc'
             del env['LDSHARED']
             sysconfig.customize_compiler(self.cc)
@@ -268,7 +268,7 @@ def gcvs(*args, _orig=sysconfig.get_config_vars):
             mock.patch.object(self.cc, 'spawn', return_value=None) as mock_spawn,
             mock.patch.object(self.cc, '_need_link', return_value=True),
             mock.patch.object(self.cc, 'mkpath', return_value=None),
-            EnvironmentVarGuard() as env,
+            os_helper.EnvironmentVarGuard() as env,
         ):
             # override environment overrides in case they're specified by CI
             del env['CXX']
@@ -339,7 +339,7 @@ def gcvs(*args, _orig=sysconfig.get_config_vars):
             mock.patch.object(self.cc, 'spawn', return_value=None) as mock_spawn,
             mock.patch.object(self.cc, '_need_link', return_value=True),
             mock.patch.object(self.cc, 'mkpath', return_value=None),
-            EnvironmentVarGuard() as env,
+            os_helper.EnvironmentVarGuard() as env,
         ):
             env['CC'] = 'ccache my_cc'
             env['CXX'] = 'my_cxx'
@@ -368,7 +368,7 @@ def gcvs(*args, _orig=sysconfig.get_config_vars):
 
         sysconfig.get_config_var = gcv
         sysconfig.get_config_vars = gcvs
-        with EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env['CC'] = 'my_cc'
             env['LDSHARED'] = 'my_ld -bundle -dynamic'
             sysconfig.customize_compiler(self.cc)
diff --git a/distutils/sysconfig.py b/distutils/sysconfig.py
index 7ddc869a..b6fcaf16 100644
--- a/distutils/sysconfig.py
+++ b/distutils/sysconfig.py
@@ -22,7 +22,6 @@
 from jaraco.functools import pass_none
 
 from .ccompiler import CCompiler
-from .compat import py39
 from .errors import DistutilsPlatformError
 from .util import is_mingw
 
@@ -563,7 +562,6 @@ def get_config_vars(*args: str) -> list[str | int] | dict[str, str | int]:
     global _config_vars
     if _config_vars is None:
         _config_vars = sysconfig.get_config_vars().copy()
-        py39.add_ext_suffix(_config_vars)
 
     return [_config_vars.get(name) for name in args] if args else _config_vars
 
diff --git a/distutils/tests/compat/__init__.py b/distutils/tests/compat/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/distutils/tests/compat/py39.py b/distutils/tests/compat/py39.py
deleted file mode 100644
index 76f12637..00000000
--- a/distutils/tests/compat/py39.py
+++ /dev/null
@@ -1,18 +0,0 @@
-from test.support.import_helper import (
-    CleanImport as CleanImport,
-)
-from test.support.import_helper import (
-    DirsOnSysPath as DirsOnSysPath,
-)
-from test.support.os_helper import (
-    EnvironmentVarGuard as EnvironmentVarGuard,
-)
-from test.support.os_helper import (
-    rmtree as rmtree,
-)
-from test.support.os_helper import (
-    skip_unless_symlink as skip_unless_symlink,
-)
-from test.support.os_helper import (
-    unlink as unlink,
-)
diff --git a/distutils/tests/test_build_ext.py b/distutils/tests/test_build_ext.py
index dab0507f..e2780059 100644
--- a/distutils/tests/test_build_ext.py
+++ b/distutils/tests/test_build_ext.py
@@ -29,8 +29,7 @@
 import path
 import pytest
 from test import support
-
-from .compat import py39 as import_helper
+from test.support import import_helper
 
 
 @pytest.fixture()
diff --git a/distutils/tests/test_filelist.py b/distutils/tests/test_filelist.py
index 09966da1..319c9efb 100644
--- a/distutils/tests/test_filelist.py
+++ b/distutils/tests/test_filelist.py
@@ -10,8 +10,7 @@
 
 import jaraco.path
 import pytest
-
-from .compat import py39 as os_helper
+from test.support import os_helper
 
 MANIFEST_IN = """\
 include ok
diff --git a/distutils/tests/test_spawn.py b/distutils/tests/test_spawn.py
index 3b9fc926..0f05c170 100644
--- a/distutils/tests/test_spawn.py
+++ b/distutils/tests/test_spawn.py
@@ -10,9 +10,7 @@
 
 import path
 import pytest
-from test.support import unix_shell
-
-from .compat import py39 as os_helper
+from test.support import os_helper, unix_shell
 
 
 class TestSpawn(support.TempdirManager):