diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95a036bd5..3759feba0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -2,6 +2,9 @@ name: CI
 
 on: [push, pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   tests:
     runs-on: ${{ matrix.operating-system }}