diff --git a/.github/workflows/leaderboard-backup.yml b/.github/workflows/leaderboard-backup.yml
index 65b937d..10ce6ba 100644
--- a/.github/workflows/leaderboard-backup.yml
+++ b/.github/workflows/leaderboard-backup.yml
@@ -15,7 +15,8 @@ name: Leaderboard backup
 
 on:
   schedule:
-    - cron: '17 3 * * 1'
+    # GitHub cron runs in UTC: Sunday 17:00 UTC is Monday 00:00 in Vietnam.
+    - cron: '0 17 * * 0'
   workflow_dispatch:
 
 permissions: