diff --git a/docker-compose.ci.yml b/docker-compose.ci.yml
index cb29108..3588395 100644
--- a/docker-compose.ci.yml
+++ b/docker-compose.ci.yml
@@ -1,3 +1,6 @@
-web:
-  env_file:
-    - development.env.template
+version: '3.8'
+
+services:
+  web:
+    env_file:
+      - development.env.template
diff --git a/docker-compose.override.yml b/docker-compose.override.yml
index e5ebd64..a519222 100644
--- a/docker-compose.override.yml
+++ b/docker-compose.override.yml
@@ -1,6 +1,12 @@
-web:
-  volumes:
-    - .:/home/app/wedding
-    - /usr/local/bundle
-  env_file:
-    - development.env
+version: '3.8'
+
+services:
+  web:
+    volumes:
+      - .:/home/app/wedding
+      - web_bundle:/usr/local/bundle
+    env_file:
+      - development.env
+
+volumes:
+  web_bundle:
diff --git a/docker-compose.yml b/docker-compose.yml
index b49df1d..69594a9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,13 +1,16 @@
-db:
-  image: postgres:10
-  environment:
-    POSTGRES_HOST_AUTH_METHOD: trust
-  ports:
-    - '5432:5432'
+version: '3.8'
 
-web:
-  build: .
-  ports:
-    - '3000:3000'
-  links:
-    - db
+services:
+  db:
+    image: postgres:10
+    environment:
+      POSTGRES_HOST_AUTH_METHOD: trust
+    ports:
+      - '5432:5432'
+
+  web:
+    build: .
+    ports:
+      - '3000:3000'
+    links:
+      - db