diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index f6199e20..455a6a07 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -1,5 +1,7 @@
 name: tox
 on: [push, pull_request]
+permissions:
+  contents: read # to fetch code (actions/checkout)
 jobs:
   tox:
     strategy: