diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 1951e22..cd0e131 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -1,5 +1,9 @@
 name: GitHub CI
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 jobs:
   build:
     runs-on: ubuntu-latest