diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a3f6402..a488ab9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,6 +8,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   check:
     name: Typecheck & Test