diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index bfe0113..4578b32 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -22,7 +22,7 @@ jobs:
         - jruby-10.0
       fail-fast: false
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.2
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: "${{ matrix.ruby }}"
diff --git a/.github/workflows/rubocop.yml b/.github/workflows/rubocop.yml
index ac1fab6..4c8781f 100644
--- a/.github/workflows/rubocop.yml
+++ b/.github/workflows/rubocop.yml
@@ -8,7 +8,7 @@ jobs:
   rubocop:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v6.0.2
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: '4'