diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 71377d24..4c3239a5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,9 @@
 name: CI
 
-on: push
+on:
+  push:
+    branches:
+      - master
 
 permissions:
   contents: write