diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 292b983..c643d87 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,5 +1,7 @@
 name: ci
-on: [push, pull_request]
+on:
+  push: { branches: main }
+  pull_request: { branches: main }
 jobs:
   build:
     runs-on: ubuntu-latest