diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index a75c967..648f6d2 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -1,6 +1,10 @@
 name: Python package
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 jobs:
   build: