diff --git a/.github/workflows/auto-testing.yml b/.github/workflows/auto-testing.yml
index 5d58cbe0..c01996d5 100644
--- a/.github/workflows/auto-testing.yml
+++ b/.github/workflows/auto-testing.yml
@@ -20,11 +20,11 @@ jobs:
           - '3.12'
           - '3.13'
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         submodules: true
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -53,11 +53,11 @@ jobs:
           - '3.12'
           - '3.13'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           submodules: true
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies & lib
@@ -66,3 +66,14 @@ jobs:
           pip install -e .
       - name: Run import check
         run: python import_check.py
+
+  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/.github/workflows/check-eol-newrelease.yml b/.github/workflows/check-eol-newrelease.yml
index 74810225..1c687ebc 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 97acd510..45630e22 100644
--- a/.github/workflows/generate-code.yml
+++ b/.github/workflows/generate-code.yml
@@ -13,14 +13,14 @@ 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
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@cdca7365b2dadb8aad0a33bc7601856ffabcc48e # v4.3.0
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
         with:
           python-version: '3.x'
       - name: Generate code
diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index 57ec25f3..5309bd3c 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -18,11 +18,11 @@ jobs:
     permissions:
       issues: write
     steps:
-    - uses: actions/checkout@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: Install dependencies
@@ -45,14 +45,14 @@ jobs:
         python setup.py sdist bdist_wheel
 
     - name: upload artifact
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
       with:
         name: release-dists
         path: dist/
 
     - name: Create GitHub Issue on Failure
       if: failure()
-      uses: actions/github-script@v7
+      uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
       with:
         script: |
           const { owner, repo } = context.repo;
@@ -81,7 +81,7 @@ jobs:
 
     steps:
       - name: Retrieve release distributions
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@95815c38cf2ff2164869cbab79da8d1f422bc89e # v4.2.1
         with:
           name: release-dists
           path: dist/
@@ -91,7 +91,7 @@ jobs:
 
       - name: Create GitHub Issue on Failure
         if: failure()
-        uses: actions/github-script@v7
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with:
           script: |
             const { owner, repo } = context.repo;
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,