certbot ImportError: ‘pyOpenSSL’ module missing required functionality

Если при попытке выпустить SSL-сертификат с помощью certbot на CentOS 7 возникает следующая ошибка:

[admin ~]# certbot --nginx
Traceback (most recent call last):
  File "/usr/bin/certbot", line 9, in 
    load_entry_point('certbot==0.22.2', 'console_scripts', 'certbot')()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 480, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2693, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2324, in load
    return self.resolve()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2330, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python2.7/site-packages/certbot/main.py", line 20, in 
    from certbot import client
  File "/usr/lib/python2.7/site-packages/certbot/client.py", line 13, in 
    from acme import client as acme_client
  File "/usr/lib/python2.7/site-packages/acme/client.py", line 36, in 
    urllib3.contrib.pyopenssl.inject_into_urllib3()
  File "/usr/lib/python2.7/site-packages/urllib3/contrib/pyopenssl.py", line 112, in inject_into_urllib3
    _validate_dependencies_met()
  File "/usr/lib/python2.7/site-packages/urllib3/contrib/pyopenssl.py", line 147, in _validate_dependencies_met
    raise ImportError("'pyOpenSSL' module missing required functionality. "
ImportError: 'pyOpenSSL' module missing required functionality. Try upgrading to v0.14 or newer.

Исправляем следующим образом:

pip uninstall requests
yum reinstall python-requests

pip uninstall six
yum reinstall python-six

pip uninstall urllib3
yum reinstall python-urllib3