diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 8df135bfdc..a25f3b8e68 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest