Changing the port for MariaDB

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The below docker compose file works but I am now needing to move it to anther server where port 3306 is being used by a MYSQL container.

version: "2"
services:
  bookstack:
    image: lscr.io/linuxserver/bookstack
    container_name: bookstack-recipes
    environment:
      - PUID=1000
      - PGID=1000
      - APP_URL=https://mysite.com  
      - DB_HOST=bookstack-recipes_db
      - DB_PORT=3306
      - DB_USER=user
      - DB_PASS=dbpwd
      - DB_DATABASE=recipesapp
    volumes:
      - ./recipes_app_data:/config
    ports:
      - 6877:80
    restart: unless-stopped
    depends_on:
      - bookstack_db
  bookstack_db:
    image: lscr.io/linuxserver/mariadb
    container_name: bookstack_db
    environment:
      - PUID=1000
      - PGID=1000
      - MYSQL_ROOT_PASSWORD=rootpwd
      - TZ=Pacific/Auckland
      - MYSQL_DATABASE=recipesapp
      - MYSQL_USER=user
      - MYSQL_PASSWORD=dbpwd
    volumes:
      - ./recipes_db_data:/config
    restart: unless-stopped

I tried the below but with no success.


version: "2"
services:
  bookstack:
    image: lscr.io/linuxserver/bookstack
    container_name: bookstack-recipes
    environment:
      - PUID=1000
      - PGID=1000
      - APP_URL=https://mysite.com  
      - DB_HOST=bookstack-recipes_db
      - DB_PORT=3307
      - DB_USER=user
      - DB_PASS=dbpwd
      - DB_DATABASE=recipesapp
    volumes:
      - ./recipes_app_data:/config
    ports:
      - 6877:80
    restart: unless-stopped
    depends_on:
      - bookstack_db
  bookstack_db:
    image: lscr.io/linuxserver/mariadb
    container_name: bookstack_db
    environment:
      - PUID=1000
      - PGID=1000
      - MYSQL_ROOT_PASSWORD=rootpwd
      - TZ=Pacific/Auckland
      - MYSQL_DATABASE=recipesapp
      - MYSQL_USER=user
      - MYSQL_PASSWORD=dbpwd
    volumes:
      - ./recipes_db_data:/config
    ports:
      - 3307:3306
    restart: unless-stopped

No matter what I try, mariadb listens on 3306. I also tried setting MYSQL_TCP_PORT=3307