diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 88f35a2e..e666b548 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -1,9 +1,8 @@
 name: CodeQL
 on:
-  pull_request:
   schedule:
-    - cron: '11 3 * * 1'
-  workflow_dispatch:
+    # Daily at 00:00 Asia/Tokyo (UTC+09:00).
+    - cron: '0 15 * * *'
 permissions:
   contents: read
 concurrency: