diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2c04f85218..42632940fe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
         node-version: [8.x, 9.x, 10.x, 11.x, 12.x, 13.x]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v2.1.1
       with:
@@ -34,7 +34,7 @@ jobs:
     needs: build
     if: github.ref == 'refs/heads/master'
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Use Node.js 13.x
       uses: actions/setup-node@v2.1.1
       with:
@@ -55,7 +55,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Setup Python
       uses: actions/setup-python@v2.1.2
       with: