Что делать с ImportError: cannot import name 'UTC' from 'pytz' (unknown location)

Traceback (most recent call last):
  File "C:/Users/38068/PycharmProjects/oop/venv/Scripts/aaaaaa.py", line 1, in <module>
    from chatterbot import ChatBot
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\__init__.py", line 4, in <module>
    from .chatterbot import ChatBot
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\chatterbot.py", line 3, in <module>
    from chatterbot.logic import LogicAdapter
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\logic\__init__.py", line 1, in <module>
    from chatterbot.logic.logic_adapter import LogicAdapter
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\logic\logic_adapter.py", line 3, in <module>
    from chatterbot.search import IndexedTextSearch
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\search.py", line 1, in <module>
    from chatterbot.conversation import Statement
  File "C:\Users\38068\PycharmProjects\oop\venv\Lib\site-packages\chatterbot\conversation.py", line 1, in <module>
    from pytz import UTC
ImportError: cannot import name 'UTC' from 'pytz' (unknown location)