diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8646d1c..5dc6597 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,9 +2,9 @@ name: Ruby Gem Test
 
 on:
   push:
-    branches: [ main, test-workflow ]
+    branches: [ main, master, test-workflow ]
   pull_request:
-    branches: [ main, test-workflow ]
+    branches: [ main, master, test-workflow ]
 
 jobs:
   test: