diff --git a/.github/actions/pre-test/action.yml b/.github/actions/pre-test/action.yml
index b70c942fe..f5272c847 100644
--- a/.github/actions/pre-test/action.yml
+++ b/.github/actions/pre-test/action.yml
@@ -6,4 +6,4 @@ runs:
   using: composite
   steps:
   - uses: asottile/workflows/.github/actions/latest-git@v1.4.0
-    if: inputs.env == 'py39' && runner.os == 'Linux'
+    if: inputs.env == 'py310' && runner.os == 'Linux'
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index cedeae5e8..7ea4a444f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -10,7 +10,7 @@ repos:
     -   id: name-tests-test
     -   id: requirements-txt-fixer
 -   repo: https://github.com/asottile/setup-cfg-fmt
-    rev: v3.1.0
+    rev: v3.2.0
     hooks:
     -   id: setup-cfg-fmt
 -   repo: https://github.com/asottile/reorder-python-imports
@@ -37,7 +37,7 @@ repos:
     hooks:
     -   id: flake8
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.0
+    rev: v1.20.1
     hooks:
     -   id: mypy
         additional_dependencies: [types-pyyaml]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1434728d0..879ae0731 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+4.5.1 - 2025-12-16
+==================
+
+### Fixes
+- Fix `language: python` with `repo: local` without `additional_dependencies`.
+    - #3597 PR by @asottile.
+
 4.5.0 - 2025-11-22
 ==================
 
diff --git a/pre_commit/resources/empty_template_setup.py b/pre_commit/resources/empty_template_setup.py
index ef05eef84..e8b1ff02c 100644
--- a/pre_commit/resources/empty_template_setup.py
+++ b/pre_commit/resources/empty_template_setup.py
@@ -1,4 +1,4 @@
 from setuptools import setup
 
 
-setup(name='pre-commit-placeholder-package', version='0.0.0')
+setup(name='pre-commit-placeholder-package', version='0.0.0', py_modules=[])
diff --git a/setup.cfg b/setup.cfg
index 00c71759a..a95ee4473 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = pre_commit
-version = 4.5.0
+version = 4.5.1
 description = A framework for managing and maintaining multi-language pre-commit hooks.
 long_description = file: README.md
 long_description_content_type = text/markdown
diff --git a/tests/languages/python_test.py b/tests/languages/python_test.py
index 565525a40..593634b79 100644
--- a/tests/languages/python_test.py
+++ b/tests/languages/python_test.py
@@ -10,6 +10,8 @@
 from pre_commit.envcontext import envcontext
 from pre_commit.languages import python
 from pre_commit.prefix import Prefix
+from pre_commit.store import _make_local_repo
+from pre_commit.util import cmd_output_b
 from pre_commit.util import make_executable
 from pre_commit.util import win_exe
 from testing.auto_namedtuple import auto_namedtuple
@@ -351,3 +353,15 @@ def test_python_hook_weird_setup_cfg(tmp_path):
 
     ret = run_language(tmp_path, python, 'socks', [os.devnull])
     assert ret == (0, f'[{os.devnull!r}]\nhello hello\n'.encode())
+
+
+def test_local_repo_with_other_artifacts(tmp_path):
+    cmd_output_b('git', 'init', tmp_path)
+    _make_local_repo(str(tmp_path))
+    # pretend a rust install also ran here
+    tmp_path.joinpath('target').mkdir()
+
+    ret, out = run_language(tmp_path, python, 'python --version')
+
+    assert ret == 0
+    assert out.startswith(b'Python ')