Lately, I got this warning:

CryptographyDeprecationWarning: Python 2 is no longer supported by the Python core team. Support for it is now deprecated in cryptography, and will be removed in a future release.

Should I upgrade Gspread or Python ? Cause all code are in Python 2, it is hard to move to python 3.
pip install cryptography==2.2.2
Works fine with out warnings
CryptographyDeprecationWarning with python 2