diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4c0ad9406..b768d3a90 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,6 @@
 name: CI tests
+permissions:
+  contents: read
 
 on: [push, workflow_dispatch]