diff --git a/.github/workflows/update-manifest.yml b/.github/workflows/update-manifest.yml
new file mode 100644
index 0000000..6dc050a
--- /dev/null
+++ b/.github/workflows/update-manifest.yml
@@ -0,0 +1,35 @@
+name: Update release notes manifest
+
+on:
+  push:
+    paths:
+      - 'cinny/public/update/*.md'
+      - 'scripts/generate-update-manifest.mjs'
+
+permissions:
+  contents: write
+
+jobs:
+  manifest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Generate manifest.json
+        run: node scripts/generate-update-manifest.mjs
+
+      - name: Commit manifest if changed
+        run: |
+          if git diff --quiet -- cinny/public/update/manifest.json; then
+            echo "manifest.json unchanged"
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add cinny/public/update/manifest.json
+          git commit -m "chore: regenerate update manifest.json"
+          git push
diff --git a/cinny b/cinny
index e65a516..a20c871 160000
--- a/cinny
+++ b/cinny
@@ -1 +1 @@
-Subproject commit e65a516350c37299f31fc3270ed8f9e4c8ff99f4
+Subproject commit a20c871726edc33c908a46dd77e9b6ceb48e59ab