diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f737bb..bbcdb02 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,6 @@
 name: Continuous integration
+permissions:
+  contents: read
 
 on:
   pull_request: