diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 161ade1..36d581e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,8 +2,9 @@ name: Build CI
 
 on:
   pull_request:
-    types: [opened, reopened]
+    branches: [master]
   push:
+    branches: [master]
 
 jobs:
   build-wheel: