diff --git a/.github/workflows/conformance.yml b/.github/workflows/conformance.yml
index 904a5bd7..c28026a4 100644
--- a/.github/workflows/conformance.yml
+++ b/.github/workflows/conformance.yml
@@ -4,6 +4,9 @@ on:
   pull_request:
   push:
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
   run-conformance-test:
     runs-on: ubuntu-latest