diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 82994eb..c069a66 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,6 +12,8 @@ on:
     branches: [ master ]
   pull_request:
     branches: [ master ]
+  schedule:
+    - cron: '0 0 * * ' # At 00:00 on Monday.
 
 jobs:
   test: