diff --git a/python_pkg/lichess_bot/engine.py b/python_pkg/lichess_bot/engine.py
index b507d0a..d9fab28 100644
--- a/python_pkg/lichess_bot/engine.py
+++ b/python_pkg/lichess_bot/engine.py
@@ -53,7 +53,7 @@ class RandomEngine:
 
     def _call_engine(self, args: list[str], *, timeout: float) -> str:
         try:
-            proc = subprocess.run(
+            proc = subprocess.run(  # noqa: S603 - trusted internal C engine binary
                 [self.engine_path, *args],
                 capture_output=True,
                 text=True,
diff --git a/python_pkg/lichess_bot/tests/conftest.py b/python_pkg/lichess_bot/tests/conftest.py
index cbc08fe..03bad49 100644
--- a/python_pkg/lichess_bot/tests/conftest.py
+++ b/python_pkg/lichess_bot/tests/conftest.py
@@ -1,3 +1,5 @@
+"""Pytest configuration and fixtures for lichess_bot tests."""
+
 from pathlib import Path
 import sys