diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 7995fed..a6c5ee5 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -10,6 +10,10 @@ jobs:
     if: github.event.pull_request.draft == false
 
     steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: make check
         run: |
           pip install -r requirements.txt