diff --git a/postgres/docker-compose.yml b/postgres/docker-compose.yml
index 584e797..4680a46 100644
--- a/postgres/docker-compose.yml
+++ b/postgres/docker-compose.yml
@@ -1,3 +1,5 @@
+version: '3.4'
+
 networks:
   medicine-network:
     external: true