diff --git a/algorithms_keeper/parser/python_parser.py b/algorithms_keeper/parser/python_parser.py
index 61cebb9..4e7d485 100644
--- a/algorithms_keeper/parser/python_parser.py
+++ b/algorithms_keeper/parser/python_parser.py
@@ -72,6 +72,9 @@ class PythonParser(BaseFilesParser):
         ".csv",
         ".json",
         ".txt",
+        # Lock files (e.g. ``uv.lock``, ``poetry.lock``) are committed to keep CI
+        # reproducible; a transitive dependency bump lives only here, so allow it.
+        ".lock",
         # Good old Python file
         ".py",
         *DOCS_EXTENSIONS,
diff --git a/tests/test_parser.py b/tests/test_parser.py
index 6cf830e..805eee2 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -56,6 +56,8 @@ def test_contains_testfile(parser: PythonParser, expected: int) -> None:
             get_parser("test/test.html, test/test.cpp, test/test.py"),
             "test/test.html, test/test.cpp",
         ),
+        # Lock files are committed for reproducible CI, so they are valid.
+        (get_parser("uv.lock, sol1.py"), ""),
     ),
 )
 def test_validate_extension(parser: PythonParser, expected: str) -> None: