diff --git a/.github/workflows/sw.yml b/.github/workflows/sw.yml
index 879c458..4351c56 100644
--- a/.github/workflows/sw.yml
+++ b/.github/workflows/sw.yml
@@ -1,6 +1,11 @@
 name: sw
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  schedule:
+    # every day
+    - cron: 0 0 * * *
 
 jobs:
   build: