diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 35cdb8e..1abece0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
         python-version: ["3.6", "3.7", "3.8", "3.9"]
     name: Python ${{ matrix.python-version }}
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2.2.2
         with: