diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
index ee2f53b..81822a8 100644
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@@ -11,7 +11,7 @@ jobs:
   release-dockerimage:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Extract dyndnsd version from tag name
       run: |
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 55ad84b..d39d67c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
         - '3.1'
         - '3.2'
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby ${{ matrix.ruby-version }}
       uses: ruby/setup-ruby@v1
       with:
@@ -36,7 +36,7 @@ jobs:
   actionlint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Check workflow files
       run: |
         echo "::add-matcher::.github/actionlint-matcher.json"