diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index fa8e3cf..b6b6af4 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -8,7 +8,14 @@
 name: Ruby
 
 on:
-  [push]
+  push:
+    branches:
+      - master
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
 
 permissions:
   contents: read