diff --git a/infra/docker-compose.yml b/infra/docker-compose.yml
index 46ad412..032cbe6 100644
--- a/infra/docker-compose.yml
+++ b/infra/docker-compose.yml
@@ -138,6 +138,7 @@ networks:
     name: hiy-net
     # External so deployed app containers can join it.
     external: false
+  default: {}
 
 volumes:
   hiy-data: