diff --git a/docker-compose-pg.yml b/docker-compose-pg.yml
index 645f93e1..44bc3ec0 100644
--- a/docker-compose-pg.yml
+++ b/docker-compose-pg.yml
@@ -1,4 +1,4 @@
-version: "3"
+---
 services:
   db:
     image: postgres:latest
diff --git a/docker-compose-sqlite3.yml b/docker-compose-sqlite3.yml
index d4c66593..900cb71f 100644
--- a/docker-compose-sqlite3.yml
+++ b/docker-compose-sqlite3.yml
@@ -1,4 +1,4 @@
-version: "3"
+---
 services:
   web:
     build:
diff --git a/docker-compose.yml b/docker-compose.yml
index 9bff93f6..73f080a4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3"
+---
 services:
   db:
     image: mysql:latest