diff --git a/public_services/gourichon_org/domain/compose.yaml b/public_services/gourichon_org/domain/compose.yaml
index bb28e18..7347c47 100644
--- a/public_services/gourichon_org/domain/compose.yaml
+++ b/public_services/gourichon_org/domain/compose.yaml
@@ -1,3 +1,5 @@
+version: '3'
+
 services:
   nameserver:
     build: