diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2717ce90..70e94ee4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [master, main]
 
+permissions:
+  contents: read
+
 env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: 1