diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 596e8fbc1..b97e95b75 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,8 +7,8 @@ jobs:
     runs-on: ubuntu-latest
     container: ruby:3-buster
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v3
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
diff --git a/.github/workflows/github-pages.yml b/.github/workflows/github-pages.yml
index 0b4f7ad7d..a2b3ab1cf 100644
--- a/.github/workflows/github-pages.yml
+++ b/.github/workflows/github-pages.yml
@@ -15,8 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     container: ruby:2-buster
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v3
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
         with:
           path: vendor/bundle
           key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
@@ -30,7 +30,7 @@ jobs:
         run: bundle exec jekyll build
 
       - name: Deploy static site to gh-pages branch.
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./_site