Issues with pypi six

[0xffca]

After cloning the repository I couldn't pip install it. Here is the command (pip3 install -I . gave me ssl error that's why i put the --truste-host and index-url).

root@host[/var/www/MISP/PyMISP/examples]: pip3 install -I . --trusted-host pypi.python.org --index-url=http://pypi.python.org/simple/six/
Processing /var/www/MISP/PyMISP
Collecting six (from pymisp==2.4.81.2)
Could not find a version that satisfies the requirement six (from pymisp==2.4.81.2) (from versions: )
No matching distribution found for six (from pymisp==2.4.81.2)