diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4c67b5d..f62a672 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup Hugo
         uses: peaceiris/actions-hugo@v2.4.13