diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d0da95f7..5d6cc300 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -2,6 +2,9 @@ name: Tests
 
 on: ['push', 'pull_request']
 
+permissions:
+  contents: read
+
 jobs:
   ci:
     runs-on: ${{ matrix.os }}