diff --git a/.github/bottleneck-action/action.yml b/.github/bottleneck-action/action.yml
index 412ebd682..8576a157e 100644
--- a/.github/bottleneck-action/action.yml
+++ b/.github/bottleneck-action/action.yml
@@ -17,4 +17,4 @@ runs:
       shell: bash
       run: |
         cd doc  # avoid picking up bottleneck from the source dir
-        uv run --no-sync pytest --pyargs bottleneck
+        uv run --no-sync pytest --pyargs bottleneck ${{ case( endsWith(matrix.python-version, 't'), '--parallel-threads=auto', '' ) }}