diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c61fd78..1e27710 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on: [push, pull_request]
 env:
   CARGO_TERM_COLOR: always
 
+permissions:
+  contents: read
+
 jobs:
   rustfmt:
     runs-on: ubuntu-24.04