当尝试使用docker-compose启动一个docker容器时，我得到以下错误消息：

(node:8) [MONGODB DRIVER] Warning: Current Server Discovery 

and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
mongo-express    | Could not connect to database using connectionString: mongodb://127.0.0.1:27017/"

我注意到mongo-express总是在我的连接字符串末尾添加一个双引号，这是故意的还是我在docker-compose文件中搞砸了？
文件：

version: '3.8'
services:
    mongodb:
        image: mongo:latest
        container_name: mongodb
        restart: unless-stopped
        networks:
            - backbone
        expose:
            - 27017
        ports:
            - 27017:27017
        env_file:
            - ./.env
        command: [--auth]
        environment:
            - MONGO_INITDB_ROOT_USERNAME=${DB_USERNAME}
            - MONGO_INITDB_ROOT_PASSWORD=${DB_PASSWORD}
        volumes:
            - ./data:/data/db

    mongo-express:
        image: mongo-express
        container_name: mongo-express
        restart: unless-stopped
        networks:
            - backbone
        ports:
            - 8081:8081
        environment:
            - ME_CONFIG_MONGODB_SERVER=127.0.0.1
            - ME_CONFIG_MONGODB_URL="mongodb://127.0.0.1:27017"
            - ME_CONFIG_BASICAUTH_USERNAME=${DB_USERNAME}
            - ME_CONFIG_BASICAUTH_PASSWORD=${DB_PASSWORD}

networks:
    backbone:
        driver: bridge

我已经尝试过更新我的docker/docker-compose和mongodb版本。
如何解决错误？或者有没有一个我可以使用的变通方法？