diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c5fe0fa0..9eb6967a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,8 @@
-on: [push, pull_request]
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
 
 name: Continuous integration