diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2684ed1..cfd37e1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
   browsers:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - uses: actions/setup-node@v2.1.5
     - name: Install Dependencies
       run: npm install
@@ -28,7 +28,7 @@ jobs:
       matrix:
         node-version: [10, 11, 12, 13, 14, 15, 16]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v2.1.5
       with:
@@ -44,7 +44,7 @@ jobs:
       matrix:
         node-version: [6, 8]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v2.1.5
       with: