diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ad3626c..467384c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
         ruby: [ '2.7', '3.0', '3.1' ]
     runs-on: ${{ matrix.os }}-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index f0d6668..1c63857 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 3.1