diff --git a/.github/workflows/check-eol-newrelease.yml b/.github/workflows/check-eol-newrelease.yml
index 2fe9a91e..020239ea 100644
--- a/.github/workflows/check-eol-newrelease.yml
+++ b/.github/workflows/check-eol-newrelease.yml
@@ -11,10 +11,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - name: Run EoL & NewRelease check
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const checkEolAndNewReleases = require('.github/scripts/check-eol-newrelease.cjs');
diff --git a/.github/workflows/close-issue.yml b/.github/workflows/close-issue.yml
index 781b5ea0..31e4ad3a 100644
--- a/.github/workflows/close-issue.yml
+++ b/.github/workflows/close-issue.yml
@@ -12,7 +12,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639 # v9.1.0
         with:
           days-before-issue-stale: 14
           days-before-issue-close: 0
diff --git a/.github/workflows/create-draft-release.yml b/.github/workflows/create-draft-release.yml
index 95c4b465..75165a83 100644
--- a/.github/workflows/create-draft-release.yml
+++ b/.github/workflows/create-draft-release.yml
@@ -43,10 +43,10 @@ jobs:
     needs: validate-input
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Fetch Latest Release
         id: get-latest-release
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const latestRelease = await github.rest.repos.getLatestRelease({
@@ -62,7 +62,7 @@ jobs:
 
       - name: Calculate New Version
         id: calculate-version
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const latestTag = '${{ steps.get-latest-release.outputs.latest_tag }}';
@@ -83,7 +83,7 @@ jobs:
 
       - name: Generate Release Notes
         id: generate-release-notes
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const { data: releaseNotes } = await github.rest.repos.generateReleaseNotes({
diff --git a/.github/workflows/generate-code.yml b/.github/workflows/generate-code.yml
index a04295ad..d5829d70 100644
--- a/.github/workflows/generate-code.yml
+++ b/.github/workflows/generate-code.yml
@@ -13,19 +13,19 @@ jobs:
 
     steps:
       - name: Setup
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: recursive
       - name: Update submodules
         run: git submodule update --remote --recursive
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: '3.x'
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4.3.0
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5.4.0
         with:
           go-version: '1.24'
       - name: Install goimports
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 826fd3b7..a51e8055 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -17,17 +17,17 @@ jobs:
         - '1.22'
         - '1.23'
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         submodules: true
 
     - name: Set up Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
       with:
         python-version: '3.x'
 
     - name: Set up Go
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5.4.0
       with:
         go-version: ${{ matrix.go }}
 
@@ -55,3 +55,14 @@ jobs:
 
     - name: Publish to codecov.io
       run: bash <(curl -s https://codecov.io/bash)
+
+  pinact:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - name: Run pinact
+        uses: suzuki-shunsuke/pinact-action@a6896d13d22e2bf108a78b0c52d3f867c1f41b34 # v0.2.1
+        with:
+          skip_push: "true"
diff --git a/renovate.json5 b/renovate.json5
index cd50949d..7a930a76 100644
--- a/renovate.json5
+++ b/renovate.json5
@@ -1,7 +1,8 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
-    "config:recommended"
+    "config:recommended",
+    "helpers:pinGitHubActionDigestsToSemver"
   ],
   "timezone": "Asia/Tokyo",
   "automerge": true,