diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 2dfb84f0..8eda0caf 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -1,5 +1,7 @@
 name: Run 2.x PHPUnit tests
 on:
+  schedule:
+    - cron: '0 8 * * *' # Run at 8AM UTC.
   push:
     branches:
       - '2.x'