diff --git a/.github/workflows/commit-check.yml b/.github/workflows/commit-check.yml
index 967657d..96d775a 100644
--- a/.github/workflows/commit-check.yml
+++ b/.github/workflows/commit-check.yml
@@ -10,6 +10,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - uses: ./  # self test
         with:
           message: true
diff --git a/.gitignore b/.gitignore
index f7275bb..43f4b6f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 venv/
+.venv/