diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..661db58
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+/.github/** @Andarist @bluwy
diff --git a/.github/actions/ci-setup/action.yml b/.github/actions/ci-setup/action.yml
index 9792cc3..200c537 100644
--- a/.github/actions/ci-setup/action.yml
+++ b/.github/actions/ci-setup/action.yml
@@ -6,6 +6,10 @@ inputs:
     description: Node.js version
     required: false
     default: 24
+  skip-cache:
+    description: "Whether to skip the cache"
+    required: false
+    default: "false"
 
 runs:
   using: composite
@@ -17,8 +21,9 @@ runs:
       uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
       with:
         node-version: ${{ inputs.node-version }}
-        cache: pnpm
+        package-manager-cache: ${{ inputs.skip-cache != 'true' }}
+        cache: ${{ inputs.skip-cache != 'true' && 'pnpm' || '' }}
 
     - name: Install dependencies
       shell: bash
-      run: pnpm install
+      run: pnpm install --frozen-lockfile
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..7495a7f
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,13 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "npm" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index aa40be5..be044f5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,13 +2,39 @@ name: CI
 
 on:
   pull_request:
-  push:
+  # merge queue is required so all commits on target branches trigger this workflow
+  # despite lack of the push event trigger here
+  merge_group:
     branches:
       - main
 
-permissions: {}
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.sha }}
+  cancel-in-progress: true
 
 jobs:
+  lint-workflows:
+    name: Lint workflows
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read # only required in private repos
+      security-events: write # allow writing security events
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Run zizmor
+        uses: zizmorcore/zizmor-action@b1d7e1fb5de872772f31590499237e7cce841e8e # v0.5.3
+        with:
+          persona: pedantic
+          annotations: true
+          advanced-security: false
+
   test:
     name: Test
     runs-on: ubuntu-latest
@@ -19,6 +45,8 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: ./.github/actions/ci-setup
 
@@ -39,3 +67,13 @@ jobs:
 
       - name: Test
         run: pnpm test
+
+  ci-ok:
+    name: CI OK
+    runs-on: ubuntu-latest
+    if: always()
+    needs: [lint-workflows, test]
+    steps:
+      - name: Exit with error if some jobs are not successful
+        run: exit 1
+        if: ${{ always() && (contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')) }}
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index ff70e29..2723f27 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -5,7 +5,10 @@ on:
     branches:
       - main
 
-concurrency: ${{ github.workflow }}-${{ github.ref }}
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+  queue: max
 
 permissions: {}
 
@@ -22,8 +25,12 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: ./.github/actions/ci-setup
+        with:
+          skip-cache: true # avoid cache poisoning attacks
 
       - name: Create or update release pull request
         id: changesets
@@ -42,8 +49,12 @@ jobs:
     steps:
       - name: Check out repo
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: ./.github/actions/ci-setup
+        with:
+          skip-cache: true # avoid cache poisoning attacks
 
       - name: Build
         run: pnpm build