diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index 4ac1329e8b..050b3d9107 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -5,6 +5,9 @@ on:
     branches:
       main
 
+# Drop all default GITHUB_TOKEN permissions; each job declares its own least-privilege set.
+permissions: {}
+
 jobs:
   bench:
     name: Benchmarks