diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0b0b5dc..37a0239 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
       - name: Set up Python ${{ env.MASTER_PYTHON }}
         uses: actions/setup-python@v2
         with:
@@ -46,7 +46,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
       - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v2
         with:
@@ -73,7 +73,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
       - name: Set up Python ${{ env.MASTER_PYTHON }}
         uses: actions/setup-python@v2
         with:
@@ -103,7 +103,7 @@ jobs:
     needs: [lint, test, docs]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
       - name: Set up Python ${{ env.MASTER_PYTHON }}
         uses: actions/setup-python@v2
         with: