diff --git a/.github/workflows/build-gems.yml b/.github/workflows/build-gems.yml
index e743e2c7a..33ed6a9ee 100644
--- a/.github/workflows/build-gems.yml
+++ b/.github/workflows/build-gems.yml
@@ -31,7 +31,7 @@ jobs:
       matrix:
         ruby-platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -43,7 +43,7 @@ jobs:
           platform: ${{ matrix.ruby-platform }}
           ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: cross-gem-${{ matrix.ruby-platform }}
           path: ${{ steps.cross-gem.outputs.gem-path }}
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 84cdb22c1..a507d1367 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-24.04
     if: ${{ github.event_name == 'pull_request' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - uses: ruby/setup-ruby@v1
@@ -46,7 +46,7 @@ jobs:
           - { target: wasm32-unknown-emscripten }
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v3
         with:
@@ -69,7 +69,7 @@ jobs:
     outputs:
       entries: ${{ steps.set-matrix.outputs.entries }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.4.1"
@@ -78,7 +78,7 @@ jobs:
       - run: rake ci:pin_build_manifest
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: build-manifest
           path: build_manifest.json
@@ -96,13 +96,13 @@ jobs:
     needs: [build-rake-task-matrix]
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           submodules: true
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v6
         with:
           name: build-manifest
-      - uses: actions/cache@v4.2.3
+      - uses: actions/cache@v4.3.0
         if: ${{ matrix.entry.rubies_cache_key != null }}
         with:
           path: ./rubies
@@ -135,7 +135,7 @@ jobs:
         if: ${{ inputs.prerel_name != '' && matrix.entry.prerelease != '' }}
       - name: rake ${{ matrix.entry.task }}
         run: ./build-exec rake --verbose ${{ matrix.entry.task }}
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         if: ${{ matrix.entry.artifact }}
         with:
           name: ${{ matrix.entry.artifact_name }}
@@ -145,7 +145,7 @@ jobs:
         with:
           ruby-version: "3.4.1"
           bundler-cache: false
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         if: ${{ matrix.entry.test != '' }}
         with:
           node-version: "22.20.0"
@@ -163,14 +163,14 @@ jobs:
       id-token: write # Required for OIDC
       contents: write
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v4
+      - uses: actions/checkout@v5
+      - uses: actions/download-artifact@v6
         with:
           name: build-manifest
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v6
         with:
           path: release
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           registry-url: https://registry.npmjs.org/
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 42ff502e4..889265a26 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -21,7 +21,7 @@ jobs:
     env:
       HUGO_VERSION: 0.102.3
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.1'
@@ -32,7 +32,7 @@ jobs:
       - name: Build HTML
         run: rake doc
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ./html
 
diff --git a/.github/workflows/nightly-release.yml b/.github/workflows/nightly-release.yml
index f63de4520..89149ee03 100644
--- a/.github/workflows/nightly-release.yml
+++ b/.github/workflows/nightly-release.yml
@@ -15,7 +15,7 @@ jobs:
     outputs:
       tag-name: ${{ steps.generate-tag.outputs.TAG_NAME }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: git config
         run: |
           git config --local user.email "action@github.com"
diff --git a/.github/workflows/prune-caches.yml b/.github/workflows/prune-caches.yml
index e2c039e99..77eee5247 100644
--- a/.github/workflows/prune-caches.yml
+++ b/.github/workflows/prune-caches.yml
@@ -13,7 +13,7 @@ jobs:
   prune:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0
       - run: rake ci:prune_caches