diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 895cd3e..07091c0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,6 +5,9 @@ on:
     branches: [master]
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   check:
     runs-on: ubuntu-latest