diff --git a/.github/workflows/format.yml b/.github/workflows/format.yml
index f45dd62..4b4604a 100644
--- a/.github/workflows/format.yml
+++ b/.github/workflows/format.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main]
 
+permissions:
+  contents: read
+
 jobs:
   format-rust:
     name: cargo fmt