diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b90da37a..ff56268c 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -7,6 +7,8 @@ updates:
       day: sunday
       time: '22:00'
       timezone: Etc/UTC
+    cooldown:
+      default-days: 7
     open-pull-requests-limit: 5
     groups:
       minor-and-patch:
diff --git a/.github/workflows/l10n-lint.yml b/.github/workflows/l10n-lint.yml
index bea4f928..007af8b1 100644
--- a/.github/workflows/l10n-lint.yml
+++ b/.github/workflows/l10n-lint.yml
@@ -24,5 +24,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
       - name: Check l10n catalogs for duplicate keys
         run: make test-l10n
diff --git a/.github/workflows/lint-pr-title.yml b/.github/workflows/lint-pr-title.yml
index ee7e019e..b34856c0 100644
--- a/.github/workflows/lint-pr-title.yml
+++ b/.github/workflows/lint-pr-title.yml
@@ -7,9 +7,15 @@ on:
       - edited
       - synchronize
 
+permissions:
+  contents: read
+
 jobs:
   lint:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
     steps:
       - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
         env:
diff --git a/.github/workflows/zizmor.yml b/.github/workflows/zizmor.yml
new file mode 100644
index 00000000..7829c845
--- /dev/null
+++ b/.github/workflows/zizmor.yml
@@ -0,0 +1,30 @@
+name: Zizmor
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+  schedule:
+    # Weekly: online audits (known-vulnerable actions, impostor commits) can
+    # start failing without a code change.
+    - cron: '0 4 * * 1'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+# Only pull request runs cancel each other: a push to the default branch and
+# the weekly run share a ref, and neither should cancel the other.
+concurrency:
+  group: zizmor-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  zizmor:
+    name: Zizmor
+    uses: owncloud/reusable-workflows/.github/workflows/zizmor.yml@main