diff --git a/ci/custom_linters.py b/ci/custom_linters.py
index 4f59a4ccf..8c4aa06a0 100644
--- a/ci/custom_linters.py
+++ b/ci/custom_linters.py
@@ -60,13 +60,13 @@ def test_tests_collected_once() -> None:
     ci_patterns = _ci_patterns()
     tests_to_patterns: dict[str, set[str]] = {}
     for pattern in ci_patterns:
-        pattern = "tests/mock_vws/" + pattern
-        tests = _tests_from_pattern(ci_pattern=pattern)
+        pattern_in_dir = "tests/mock_vws/" + pattern
+        tests = _tests_from_pattern(ci_pattern=pattern_in_dir)
         for test in tests:
             if test in tests_to_patterns:
-                tests_to_patterns[test].add(pattern)
+                tests_to_patterns[test].add(pattern_in_dir)
             else:
-                tests_to_patterns[test] = {pattern}
+                tests_to_patterns[test] = {pattern_in_dir}
 
     for test_name, patterns in tests_to_patterns.items():
         message = (
diff --git a/requirements/dev-requirements.txt b/requirements/dev-requirements.txt
index 9ecae806f..1e2b5eb12 100644
--- a/requirements/dev-requirements.txt
+++ b/requirements/dev-requirements.txt
@@ -21,7 +21,7 @@ pytest-cov==4.0.0  # Measure code coverage
 pytest-envfiles==0.1.0  # Use files for environment variables for tests
 pytest==7.2.1  # Test runners
 requests-mock-flask==2022.4.3
-ruff==0.0.251
+ruff==0.0.253
 sphinx-autodoc-typehints==1.22
 sphinx-prompt==1.5.0
 sphinx_paramlinks==0.5.4