diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9d83408..931f196 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,11 @@
 name: CI
 
-on: [ push ]
+on:
+  push:
+    branches:
+      - '*'
+      - '*/*'
+      - '!master'
 
 jobs:
   unix: