diff --git a/.github/workflows/nosetests.yml b/.github/workflows/nosetests.yml
index fb6863a..869773f 100644
--- a/.github/workflows/nosetests.yml
+++ b/.github/workflows/nosetests.yml
@@ -1,6 +1,10 @@
 name: Python application
 
-on: [push]
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
 
 jobs:
   build: