diff --git a/docker/mariadb/docker-compose.yaml b/docker/mariadb/docker-compose.yaml
index 5a7bdc7..ea27685 100644
--- a/docker/mariadb/docker-compose.yaml
+++ b/docker/mariadb/docker-compose.yaml
@@ -1,16 +1,18 @@
-mariadb:
-  container_name: mariadb
-  image: mariadb
-  environment:
-    - TZ=Europe/Helsinki
-    - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
-  networks:
-    - mariadb
-  volumes:
-    - /docker/mariadb:/var/lib/mysql
-    - /etc/localtime:/etc/localtime:ro
-  restart: always
+version: "3"
+services:
+  mariadb:
+    container_name: mariadb
+    image: mariadb
+    environment:
+      - TZ=Europe/Helsinki
+      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
+    networks:
+      - mariadb
+    volumes:
+      - /docker/mariadb:/var/lib/mysql
+      - /etc/localtime:/etc/localtime:ro
+    restart: always
 
-networks:
-  db:
-    external: true
+  networks:
+    db:
+      external: true