diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dba9cdf..709bd8d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,9 +2,12 @@ name: ci
 
 on:
   push:
-    branches: [master, 'v*']
+    branches: [main, 'v*']
   pull_request:
-    branches: [master, 'v*']
+    branches: [main, 'v*']
+
+permissions:
+  contents: read
 
 permissions:
   contents: read