diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 6123ac0..afa2ff1 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -21,7 +21,7 @@ jobs:
         os: ["windows-latest", "ubuntu-latest"]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with: