Not sure about this urllib3 dependency. I grabbed it from https://github.com/celery/kombu/commit/f3b04558fa0df4ecc383c93e0b3b300d95e17c47    The comment about version 1.28 and above breaking no longer makes much sense but from what I can see no 1.28 version even exist for urllib3, see https://pypi.org/project/urllib3/#history. \U0001f914     