diff --git a/.gitea/workflows/shots.yml b/.gitea/workflows/shots.yml
index 2fccb31..c8321ad 100644
--- a/.gitea/workflows/shots.yml
+++ b/.gitea/workflows/shots.yml
@@ -6,7 +6,7 @@ on:
   workflow_dispatch:
   push:
     branches: [main]
-    paths: [index.html, brain.js, favicon.svg, icons/icon.svg, tools/shots.sh, tools/icons.py]
+    paths: [index.html, brain.js, favicon.svg, manifest.json, icons/icon.svg, tools/shots.sh, tools/icons.py]
 permissions:
   contents: write
 concurrency:
@@ -37,12 +37,14 @@ jobs:
         env:
           CHROME_FLAGS: "--no-sandbox --disable-dev-shm-usage --disable-gpu"
         run: sh tools/shots.sh
+      - name: stamp the service worker
+        run: sed -i "s/^const REV = \".*\";/const REV = \"${GITHUB_SHA::12}\";/" sw.js && grep '^const REV' sw.js
       - name: commit
         run: |
           set -eu
-          git add shots/desktop.png icons/icon-512.png icons/icon-192.png icons/apple-touch-icon.png
+          git add shots/desktop.png icons/icon-512.png icons/icon-192.png icons/apple-touch-icon.png sw.js
           if git diff --cached --quiet; then echo "shots unchanged"; exit 0; fi
-          git -c user.name='gitea-actions[bot]' -c user.email='gitea-actions[bot]@users.noreply.teahub.xyz' commit -q -m "shots: desktop.png + icons"
+          git -c user.name='gitea-actions[bot]' -c user.email='gitea-actions[bot]@users.noreply.teahub.xyz' commit -q -m "shots + sw stamp ${GITHUB_SHA::12}"
           git push -q origin HEAD:main
       - name: tell Teahub pages to pull
         run: curl -fsS -X POST "https://gandora.yolopreneur.lol/_hook/gandora/site" || echo "pages pulls by itself within five minutes"