diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 06bf452..d29fd3e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -3,6 +3,9 @@ on:
   push:
     branches:
       - master
+  schedule:
+    # Every Sunday.
+    - cron: '0 0 * * 0'
 jobs:
   build:
     runs-on: ubuntu-latest