diff --git a/.github/workflows/pr_tests.yml b/.github/workflows/pr_tests.yml
index 3e69dfd05e..02dee7d541 100644
--- a/.github/workflows/pr_tests.yml
+++ b/.github/workflows/pr_tests.yml
@@ -16,6 +16,9 @@ on:
     branches:
       - ci-*
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true