diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bfbd2f9d..cf4c7041 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,6 +1,10 @@
 ---
 name: CI
-'on': [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}