diff --git a/ci/r.yml b/ci/r.yml
index afb870e..68f02d7 100644
--- a/ci/r.yml
+++ b/ci/r.yml
@@ -14,6 +14,9 @@ on:
   pull_request:
     branches: [ $default-branch ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: macos-latest