diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index cd4f3a7..bf8b14e 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -41,5 +41,6 @@
   },
   "no_docs": true,
   "project_id": "flutter",
+  "py3_only": true,
   "repo_name": "flutter"
 }