diff --git a/.github/actions/setup-duckdb/action.yml b/.github/actions/setup-duckdb/action.yml
index a2c26a366..2d6b30479 100644
--- a/.github/actions/setup-duckdb/action.yml
+++ b/.github/actions/setup-duckdb/action.yml
@@ -4,7 +4,7 @@ runs:
   using: composite
   steps:
     - shell: bash
-      run: |
+      run: | # zizmor: ignore[github-env] appends a fixed RUNNER_TEMP path holding the checksum-verified CLI
         set -euo pipefail
         archive="$RUNNER_TEMP/duckdb-cli.zip"
         install_dir="$RUNNER_TEMP/duckdb-cli"
diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
index 912f696d7..3d58503b9 100644
--- a/.github/actions/setup/action.yml
+++ b/.github/actions/setup/action.yml
@@ -7,7 +7,7 @@ runs:
       with:
         node-version: 24
         package-manager-cache: false
-    - uses: pnpm/action-setup@f520eceda224fe1a4aed5a2a27a194379a409996 # v6
+    - uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6
       with:
         run_install: false
         cache: true
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 000000000..a1146f5b1
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,36 @@
+# See origin89hq/engineering docs/dependencies.md.
+version: 2
+
+updates:
+  # Composite actions are not scanned from the root directory.
+  - package-ecosystem: github-actions
+    directories:
+      - /
+      - /.github/actions/setup
+      - /.github/actions/setup-duckdb
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+    groups:
+      actions:
+        patterns: ["*"]
+        update-types: [minor, patch]
+    commit-message:
+      prefix: ci
+
+  # pnpm workspaces use the npm ecosystem from the directory holding the lockfile.
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    # At least pnpm's minimumReleaseAge, or the frozen install rejects the update.
+    cooldown:
+      default-days: 7
+    groups:
+      npm:
+        patterns: ["*"]
+        update-types: [minor, patch]
+    commit-message:
+      prefix: chore
+      include: scope
diff --git a/.github/workflows/origin89-security.yml b/.github/workflows/origin89-security.yml
new file mode 100644
index 000000000..408bd69a3
--- /dev/null
+++ b/.github/workflows/origin89-security.yml
@@ -0,0 +1,47 @@
+# See origin89hq/engineering docs/dependencies.md.
+name: origin89-security
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+  # New advisories arrive without a code change.
+  schedule:
+    - cron: "17 6 * * 1"
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+      - uses: actions/dependency-review-action@a1d282b36b6f3519aa1f3fc636f609c47dddb294 # v5.0.0
+        with:
+          fail-on-severity: moderate
+          fail-on-scopes: runtime, development
+          # Checked only for dependencies the pull request adds. Unknown
+          # licenses are reported without failing.
+          allow-licenses: >-
+            0BSD, Apache-2.0, BlueOak-1.0.0, BSD-2-Clause, BSD-3-Clause,
+            CC-BY-4.0, CC0-1.0, ISC, MIT, MPL-2.0, Python-2.0, Unicode-3.0,
+            Unlicense, Zlib
+
+  zizmor:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+        with:
+          persist-credentials: false
+      - uses: zizmorcore/zizmor-action@cc914d7f3750a2d13d75c7f184a1060aa0e9d482 # v0.6.4
+        with:
+          version: 1.30.1
+          advanced-security: false
+          annotations: true
+          min-severity: medium
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 67d2f7a8d..3955c8773 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,7 +9,7 @@ name: Publish the dataset
 # much again when it is retired. That is about $2.50 a version, and four merges that touched
 # records in a day were four of them for one day's figures. A day's merges now go out together.
 # `workflow_dispatch` publishes at once when something should not wait.
-on:
+on: # zizmor: ignore[dangerous-triggers] reviewed: only the manual main-branch deploy triggers it, and it checks out main, not the run's head
   schedule:
     # Eleven hours after the daily pull opens its pull request, so a day's records go out the
     # evening they are merged.