diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 18d9102..52582f0 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -1,7 +1,14 @@
 name: Ruby
 
 on:
-  [push]
+  push:
+    branches:
+      - master
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
 
 jobs:
   test: