diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9df46e31..a8bbd756 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,6 +8,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+
 jobs:
   ci:
     runs-on: ${{ matrix.os }}