diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index da2e6e5..da61a80 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,6 +5,12 @@ on:
     branches: [main]
   pull_request:
     branches: ['**']
+  # daily on main (scheduled runs always use the default branch), so a
+  # breaking change in a dependency, runner image or upstream download shows
+  # up even on a day without any commit
+  schedule:
+    - cron: '0 18 * * *'
+      timezone: Europe/Berlin
   # by hand for any branch: 'Run workflow' in the Actions tab, or
   # `gh workflow run test.yml --ref <branch>`
   workflow_dispatch: