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Celery can install kombu>=4.2.0
https://github.com/celery/celery/blob/v4.1.1/requirements/default.txt#L3
But kombu>4.3.0 requires redis>=3.2
https://github.com/celery/kombu/blob/v4.5.0/requirements/extras/redis.txt#L1