sudo pip install cryptography --upgrade
From cffi callback <function _verify_callback at 0xb5d35df0>:
Traceback (most recent call last):
  File "build/bdist.linux-armv6l/egg/OpenSSL/SSL.py", line 313, in wrapper
AttributeError: 'module' object has no attribute 'X509_up_ref'
From cffi callback <function _verify_callback at 0xb53f31f0>:
Traceback (most recent call last):
  File "build/bdist.linux-armv6l/egg/OpenSSL/SSL.py", line 313, in wrapper
AttributeError: 'module' object has no attribute 'X509_up_ref'
Requirement already up-to-date: cryptography in /usr/lib/python2.7/dist-packages