diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index be3564798..cf93bf94a 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -8,6 +8,12 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions:
+        patterns:
+          - "*"
     labels:
       - "dependencies"
 
@@ -15,5 +21,11 @@ updates:
     directory: "/docs"
     schedule:
       interval: "weekly"
+    cooldown:
+      default-days: 7
+    groups:
+      npm:
+        patterns:
+          - "*"
     labels:
-      - "dependencies"
\ No newline at end of file
+      - "dependencies"
diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 7fc9639a0..e84727337 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -1,20 +1,24 @@
 name: Auto-Merge
 
-on: pull_request_target
+on: pull_request
 
 permissions:
-  pull-requests: write
-  contents: write
+  contents: read
 
 jobs:
   dependabot:
     runs-on: ubuntu-latest
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
+
+    permissions:
+      pull-requests: write
+      contents: write
+
     steps:
 
       - name: Dependabot metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v3.1.0
+        uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98 # v3.1.0
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
 
diff --git a/.github/workflows/changelog.yml b/.github/workflows/changelog.yml
index 4e99bccc5..4cdc562a7 100644
--- a/.github/workflows/changelog.yml
+++ b/.github/workflows/changelog.yml
@@ -15,29 +15,32 @@ jobs:
     steps:
       - name: Determine target branch
         id: branch
+        env:
+          TAG: ${{ github.event.release.tag_name }}
+          REPO: ${{ github.repository }}
+          DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
         run: |
-          TAG="${{ github.event.release.tag_name }}"
           MAJOR=$(echo "$TAG" | sed -E 's/^v?([0-9]+)\..*/\1/')
           BRANCH="${MAJOR}.x"
-          if ! git ls-remote --exit-code --heads "https://github.com/${{ github.repository }}" "$BRANCH" > /dev/null 2>&1; then
-            BRANCH="${{ github.event.repository.default_branch }}"
+          if ! git ls-remote --exit-code --heads "https://github.com/$REPO" "$BRANCH" > /dev/null 2>&1; then
+            BRANCH="$DEFAULT_BRANCH"
           fi
-          echo "name=${BRANCH}" >> $GITHUB_OUTPUT
+          echo "name=${BRANCH}" >> "$GITHUB_OUTPUT"
 
       - name: Checkout code
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: ${{ steps.branch.outputs.name }}
 
       - name: Update Changelog
-        uses: stefanzweifel/changelog-updater-action@v1
+        uses: stefanzweifel/changelog-updater-action@a938690fad7edf25368f37e43a1ed1b34303eb36 # v1.12.0
         with:
           latest-version: ${{ github.event.release.name }}
           release-notes: ${{ github.event.release.body }}
 
       - name: Open changelog PR
         id: cpr
-        uses: peter-evans/create-pull-request@v8
+        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8.1.1
         with:
           base: ${{ steps.branch.outputs.name }}
           branch: chore/changelog-${{ github.event.release.tag_name }}
@@ -54,4 +57,5 @@ jobs:
         if: steps.cpr.outputs.pull-request-operation == 'created'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: gh pr merge --auto --squash "${{ steps.cpr.outputs.pull-request-number }}"
+          PR_NUMBER: ${{ steps.cpr.outputs.pull-request-number }}
+        run: gh pr merge --auto --squash "$PR_NUMBER"
diff --git a/.github/workflows/deploy-docs.yml b/.github/workflows/deploy-docs.yml
index fd479202a..c6aea6064 100644
--- a/.github/workflows/deploy-docs.yml
+++ b/.github/workflows/deploy-docs.yml
@@ -65,18 +65,18 @@ jobs:
           esac
 
       - name: Checkout source branch
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: ${{ steps.version.outputs.branch }}
 
       - name: Checkout gh-pages
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: gh-pages
           path: gh-pages
 
       - name: Setup Node.js
-        uses: actions/setup-node@v7
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: '24'
           cache: 'npm'
diff --git a/.github/workflows/pint.yml b/.github/workflows/pint.yml
index 8f8f8c816..ad69628c1 100644
--- a/.github/workflows/pint.yml
+++ b/.github/workflows/pint.yml
@@ -14,14 +14,14 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: ${{ github.head_ref }}
 
       - name: Fix PHP code style issues
-        uses: aglipanci/laravel-pint-action@2.6
+        uses: aglipanci/laravel-pint-action@36de00d5f5a8a4e12d443e01671daa12a18f4c79 # 2.6
 
       - name: Commit changes
-        uses: stefanzweifel/git-auto-commit-action@v7
+        uses: stefanzweifel/git-auto-commit-action@4a55954c782fc1ea30b9056cd3e7a2b40ca8887d # v7.2.0
         with:
           commit_message: Fix styling
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c5685095a..96c148264 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -6,16 +6,17 @@ on:
       - 'v*.*.*'
 
 permissions:
-  contents: write
+  contents: read
 
 jobs:
   tests:
     uses: ./.github/workflows/tests.yml
-    secrets: inherit
 
   release:
     needs: tests
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
 
     steps:
       - name: Determine release flags
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 91955e2cf..2d358de63 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,7 +7,37 @@ on:
     branches: [4.x]
   workflow_call:
 
+permissions:
+  contents: read
+
 jobs:
+  actions-pinned:
+    name: Actions pinned to SHA
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Assert every third-party action is pinned to a full commit SHA
+        run: |
+          unpinned=$(grep -rhoE '^[[:space:]]*-?[[:space:]]*uses:[[:space:]]*[^[:space:]]+' .github/workflows \
+            | sed -E 's/.*uses:[[:space:]]*//' \
+            | grep -v '^\./' \
+            | grep -vE '@[0-9a-f]{40}$' \
+            | sort -u || true)
+
+          if [ -n "$unpinned" ]; then
+            echo "Third-party actions must be pinned to a full 40-character commit SHA."
+            echo "Unpinned references:"
+            echo "$unpinned" | sed 's/^/  /'
+            exit 1
+          fi
+
+          echo "All third-party action references are pinned to a full commit SHA."
+
   test:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -27,10 +57,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
 
       - name: Setup PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@f3e473d116dcccaddc5834248c87452386958240 # 2.37.2
         with:
           php-version: ${{ matrix.php }}
           extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick, fileinfo
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 000000000..c9e4493c4
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,30 @@
+name: Zizmor
+
+on:
+  push:
+    paths:
+      - '.github/workflows/**'
+      - '.github/dependabot.yml'
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+      - '.github/dependabot.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  zizmor:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Audit workflows
+        uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2