diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 8dba163..03b57bd 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -10,7 +10,7 @@ jobs:
     name: code style
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7
@@ -24,7 +24,7 @@ jobs:
       matrix:
         ruby: ["2.4", "2.5", "2.6", "2.7"]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}