diff --git a/.github/workflows/actionlint.yml b/.github/workflows/actionlint.yml
new file mode 100644
index 000000000..a8b6e9d56
--- /dev/null
+++ b/.github/workflows/actionlint.yml
@@ -0,0 +1,84 @@
+# This file is synced from the `.github` repository, do not modify it directly.
+name: Actionlint
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
+defaults:
+  run:
+    shell: bash -xeuo pipefail {0}
+
+concurrency:
+  group: "actionlint-${{ github.ref }}"
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  HOMEBREW_DEVELOPER: 1
+  HOMEBREW_NO_AUTO_UPDATE: 1
+  HOMEBREW_NO_ENV_HINTS: 1
+
+permissions: {}
+
+jobs:
+  workflow_syntax:
+    if: github.repository_owner == 'Homebrew'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - name: Set up Homebrew
+        id: setup-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+        with:
+          core: false
+          cask: false
+          test-bot: false
+
+      - name: Install tools
+        run: brew install actionlint shellcheck zizmor
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          persist-credentials: false
+
+      - run: zizmor --format sarif . > results.sarif
+
+      - name: Upload SARIF file
+        uses: actions/upload-artifact@b4b15b8c7c6ac21ea08fcf65892d2ee8f75cf882 # v4
+        with:
+          name: results.sarif
+          path: results.sarif
+
+      - name: Set up actionlint
+        run: echo "::add-matcher::$(brew --repository)/.github/actionlint-matcher.json"
+
+      - run: actionlint
+
+  upload_sarif:
+    needs: workflow_syntax
+    # We want to always upload this even if `actionlint` failed.
+    # This is only available on public repositories.
+    if: >
+      always() &&
+      !contains(fromJSON('["cancelled", "skipped"]'), needs.workflow_syntax.result) &&
+      !github.event.repository.private
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Download SARIF file
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        with:
+          name: results.sarif
+          path: results.sarif
+
+      - name: Upload SARIF file
+        uses: github/codeql-action/upload-sarif@f09c1c0a94de965c15400f5634aa42fac8fb8f88 # v3
+        with:
+          sarif_file: results.sarif
+          category: zizmor
diff --git a/.github/workflows/stale-issues.yml b/.github/workflows/stale-issues.yml
index e38e019ae..ba2621be3 100644
--- a/.github/workflows/stale-issues.yml
+++ b/.github/workflows/stale-issues.yml
@@ -12,10 +12,11 @@ on:
     - cron: "0 0 * * *"
   issue_comment:
 
-permissions:
-  contents: write
-  issues: write
-  pull-requests: write
+permissions: {}
+
+defaults:
+  run:
+    shell: bash -xeuo pipefail {0}
 
 concurrency:
   group: stale-issues
@@ -31,6 +32,10 @@ jobs:
         )
       )
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
     steps:
       - name: Mark/Close Stale Issues and Pull Requests
         uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9
@@ -57,6 +62,10 @@ jobs:
         )
       )
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
     steps:
       - name: Mark/Close Stale `bump-formula-pr` and `bump-cask-pr` Pull Requests
         uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e # v9
diff --git a/.rubocop.yml b/.rubocop.yml
index 41d750484..646abda13 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -7,10 +7,10 @@ AllCops:
   - "**/*.rbi"
   Exclude:
   - Homebrew/sorbet/rbi/{dsl,gems}/**/*.rbi
-  - Homebrew/sorbet/rbi/parlour.rbi
   - Homebrew/bin/*
   - Homebrew/vendor/**/*
   - Taps/*/*/vendor/**/*
+  - "**/vendor/**/*"
   SuggestExtensions:
     rubocop-minitest: false
 Layout/ArgumentAlignment:
@@ -189,6 +189,8 @@ Style/OptionalBooleanParameter:
   AllowedMethods:
   - respond_to?
   - respond_to_missing?
+Style/RedundantLineContinuation:
+  Enabled: false
 Style/RescueStandardError:
   EnforcedStyle: implicit
 Style/ReturnNil:
diff --git a/.ruby-version b/.ruby-version
index a0891f563..9c25013db 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.3.4
+3.3.6