diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f009125..d3ce875 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,9 @@ concurrency:
   group: ci-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   build-test:
     runs-on: ubuntu-latest