diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f33c0ecb95..9f260796bf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.3
         with:
           submodules: 'recursive'