diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index a5cba749..e11bb2a1 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -18,6 +18,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v5
         with: