diff --git a/.github/workflows/claude-react-on-comment.yml b/.github/workflows/claude-react-on-comment.yml
index 982a027..8d00d6c 100644
--- a/.github/workflows/claude-react-on-comment.yml
+++ b/.github/workflows/claude-react-on-comment.yml
@@ -28,6 +28,11 @@ jobs:
     outputs:
       triggered: ${{ steps.check.outputs.triggered }}
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Check for trigger phrase"
         id: check
         env:
@@ -47,11 +52,16 @@ jobs:
     timeout-minutes: 60
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Checkout"
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: "React to feedback"
-        uses: anthropics/claude-code-action@v1
+        uses: anthropics/claude-code-action@35a9e0292d36f1186f5d842b14eb575074e8b450 # v1.0.57
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
           trigger_phrase: "@phpstan-bot"
diff --git a/.github/workflows/lock-closed-issues.yml b/.github/workflows/lock-closed-issues.yml
index 7d84dc8..fda7bbb 100644
--- a/.github/workflows/lock-closed-issues.yml
+++ b/.github/workflows/lock-closed-issues.yml
@@ -4,11 +4,21 @@ on:
   schedule:
     - cron: '4 0 * * *'
 
+permissions:
+  contents: read
+
 jobs:
   lock:
+    permissions:
+      issues: write  # for dessant/lock-threads to lock issues
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v5
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - uses: dessant/lock-threads@1bf7ec25051fe7c00bdd17e6a7cf3d7bfb7dc771 # v5.0.1
         with:
           github-token: ${{ github.token }}
           issue-inactive-days: '31'
diff --git a/.github/workflows/phpstan.yml b/.github/workflows/phpstan.yml
index 9b24b78..d896756 100644
--- a/.github/workflows/phpstan.yml
+++ b/.github/workflows/phpstan.yml
@@ -13,15 +13,23 @@ on:
       - 'extractor/**'
       - '.github/workflows/phpstan.yml'
 
+permissions:
+  contents: read
+
 jobs:
   phpstan:
     name: "PHPStan"
     runs-on: "ubuntu-latest"
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@v2"
+        uses: "shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1" # v2
         with:
           coverage: "none"
           php-version: "8.3"
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 6a6b963..c0a43d5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,16 +9,26 @@ on:
 
 concurrency: release
 
+permissions:
+  contents: read
+
 jobs:
   deploy:
+    permissions:
+      contents: write  # for softprops/action-gh-release to create GitHub release
     name: "Deploy"
     runs-on: "ubuntu-latest"
 
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
 
       - name: "Create release"
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@a06a81a03ee405af7f2048a818ed3f03bbf83c7b # v2.5.0
         with:
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}
diff --git a/.github/workflows/send-pr.yml b/.github/workflows/send-pr.yml
index 94faded..85e54fd 100644
--- a/.github/workflows/send-pr.yml
+++ b/.github/workflows/send-pr.yml
@@ -6,19 +6,27 @@ on:
   release:
     types: [published]
 
+permissions:
+  contents: read
+
 jobs:
   send-pr:
     name: "Send pull request"
     runs-on: "ubuntu-latest"
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@v2"
+        uses: "shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1" # v2
         with:
           coverage: "none"
           php-version: "8.3"
 
       - name: "Checkout phpstan-src"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: phpstan/phpstan-src
           ref: 2.1.x
@@ -40,7 +48,7 @@ jobs:
 
       - name: "Create Pull Request"
         id: create-pr
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@22a9089034f40e5a961c8808d113e2c98fb63676 # v7.0.11
         with:
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}
           path: ./phpstan-src
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 42c6c23..bab4640 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -16,18 +16,23 @@ jobs:
     name: "Update stubs"
     runs-on: "ubuntu-latest"
     steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
       - name: "Checkout to commit"
         if: github.event_name != 'pull_request'
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           ref: ${{ github.head_ref }}
           fetch-depth: '0'
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}
       - name: "Checkout to only read"
         if: github.event_name == 'pull_request'
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@v2"
+        uses: "shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1" # v2
         with:
           coverage: "none"
           php-version: "8.3"
@@ -35,7 +40,7 @@ jobs:
         run: "composer install"
         working-directory: ./extractor
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -47,7 +52,7 @@ jobs:
       - name: "Delete checked out php-src repo"
         run: "rm -rf php-src"
       - name: "Checkout PHP 8.1"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -60,7 +65,7 @@ jobs:
       - name: "Delete checked out php-src repo"
         run: "rm -rf php-src"
       - name: "Checkout PHP 8.2"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -73,7 +78,7 @@ jobs:
       - name: "Delete checked out php-src repo"
         run: "rm -rf php-src"
       - name: "Checkout PHP 8.3"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -86,7 +91,7 @@ jobs:
       - name: "Delete checked out php-src repo"
         run: "rm -rf php-src"
       - name: "Checkout PHP 8.4"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -99,7 +104,7 @@ jobs:
       - name: "Delete checked out php-src repo"
         run: "rm -rf php-src"
       - name: "Checkout PHP 8.5"
-        uses: actions/checkout@v5
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           repository: "php/php-src"
           path: "php-src"
@@ -111,17 +116,17 @@ jobs:
 
       - name: 'Get previous tag'
         id: previous_tag
-        uses: "WyriHaximus/github-action-get-previous-tag@v1"
+        uses: "WyriHaximus/github-action-get-previous-tag@04e8485ecb6487243907e330d522ff60f02283ce" # v1.4.0
         with:
           fallback: 0.1.0
       - name: 'Get next minor version'
         id: semvers
-        uses: "WyriHaximus/github-action-next-semvers@v1"
+        uses: "WyriHaximus/github-action-next-semvers@d079934efaf011a4cf8912d4637097fe35d32b93" # v1
         with:
           version: ${{ steps.previous_tag.outputs.tag }}
       - name: "Commit changes"
         if: github.event_name != 'pull_request'
-        uses: "stefanzweifel/git-auto-commit-action@v6"
+        uses: "stefanzweifel/git-auto-commit-action@778341af668090896ca464160c2def5d1d1a3eb0" # v6.0.1
         id: "commit"
         with:
           commit_message: "Update stubs"