diff --git a/.github/actions/setup-runner/action.yml b/.github/actions/setup-runner/action.yml
index 932320f1c..40cecc588 100644
--- a/.github/actions/setup-runner/action.yml
+++ b/.github/actions/setup-runner/action.yml
@@ -37,6 +37,10 @@ runs:
           echo "Exported UV environment variables for current and subsequent steps"
         fi
 
+        echo "Clearing Python bytecode cache to avoid stale .pyc files"
+        find . -type d -name "__pycache__" -exec rm -rf {} + 2>/dev/null || true
+        find . -name "*.pyc" -delete 2>/dev/null || true
+
         echo "Updating project dependencies via uv sync"
         uv sync --all-groups