Erro ao rodar docker-compose run web python manage.py makemigrations

Erro

...
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/__init__.py", line 84, in Connect
    return Connection(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/connections.py", line 164, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (1130, "Host '172.23.0.4' is not allowed to connect to this MySQL server")
ERROR: 1

Docker compose

version: '3'


services:
  db:
    image: mysql:5.7
    ports:
      - '3306:3306'
    environment:
      MYSQL_DATABASE: 'todo_dev'
      MYSQL_USER: 'devops_dev'
      MYSQL_PASSWORD: 'mestre'
      MYSQL_ROOT_PASSWORD: 'senha'
  web:
    image: aluracursos/django_todolist_image_build
    volumes:
      - ./env:/usr/src/app/to_do/.env
    ports:
      - "8000:8000"
    depends_on:
      - db

arquivo env

[config]
# Secret configuration
SECRET_KEY = 'r*5ltfzw-61ksdm41fuul8+hxs$86yo9%k1%k=(!@=-wv4qtyv'

# conf
DEBUG=True

# Database
DB_NAME = "todo_dev"
DB_USER = "devops_dev"
DB_PASSWORD = "mestre"
DB_HOST = "db"
DB_PORT = "3306"