diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index c38b2fd596..0f227e1f0b 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -1,9 +1,12 @@
 name: "Code scanning"
 
 on:
-  schedule:
-    # Friday 8AM UTC / Friday 5PM JST
-    - cron: '0 8 * * 5'
+  # schedule:
+  #   # Friday 8AM UTC / Friday 5PM JST
+  #   - cron: '0 8 * * 5'
+  pull_request:
+    branches:
+    - master
 
 jobs:
   CodeQL-Build: