diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index c02a896..3671033 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -4,9 +4,9 @@ name: PHPUnit
 
 on:
   push:
-    branches: [main]
+    branches: [master, main]
   pull_request:
-    branches: [main]
+    branches: [master, main]
 
 jobs:
   build-test: