diff --git a/.github/workflows/branch_protection.yml b/.github/workflows/branch_protection.yml
index d6cdab4..4b4857d 100644
--- a/.github/workflows/branch_protection.yml
+++ b/.github/workflows/branch_protection.yml
@@ -2,7 +2,7 @@
 name: master branch protection
 
 on:
-  push:
+  pull_request:
     branches:
       - 'master'