diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bcb5e50..0aec353 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,6 +7,9 @@ on:
     branches: [main]
   workflow_call:  # allow release workflow to reuse this
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true