bandit complains that 'six' has no 'itervalues'

Question

I have installed bandit with pip but when I run bandit --help in the command line, I get the following error:

Traceback (most recent call last):
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/bin/bandit", line 5, in <module>
    from bandit.cli.main import main
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/__init__.py", line 19, in <module>
    from bandit.core import config  # noqa
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/core/__init__.py", line 17, in <module>
    from bandit.core import config  # noqa
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/core/config.py", line 12, in <module>
    from bandit.core import extension_loader
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/core/extension_loader.py", line 109, in <module>
    MANAGER = Manager()
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/core/extension_loader.py", line 27, in __init__
    self.load_blacklists(blacklists_namespace)
  File "/home/alipqb/.local/share/virtualenvs/django_with_pytest-FUuC6zdm/lib/python3.8/site-packages/bandit/core/extension_loader.py", line 78, in load_blacklists
    for val in six.itervalues(self.blacklist):
AttributeError: module 'six' has no attribute 'itervalues'

Also I should mention that bandit is in the path and there is no problem with it.

What should I do?