diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 12a6d6c9..c65fc0d1 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 15dfefe9..8fd3f085 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
         version: [2.5, 2.6, 2.7]
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1