diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index c06ac16..7d29910 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -36,7 +36,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
diff --git a/.github/workflows/generate-javadoc-site.yml b/.github/workflows/generate-javadoc-site.yml
index 699aa2a..6062500 100644
--- a/.github/workflows/generate-javadoc-site.yml
+++ b/.github/workflows/generate-javadoc-site.yml
@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Merge master -> gh-pages
       run: |
         git config user.email "ci-bot@treasure-data.com"