diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 8526247d..67d51c04 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -1,6 +1,9 @@
 name: Tests
-on: [push]
-
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [ master ]
 jobs:
   phpunit:
     name: PHPUnit