diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 53c44d3f..fb72a70f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,6 +3,10 @@ on:
   pull_request:
   push:
     branches: [ master ]
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
   test:
     strategy: