When I try
pip install --upgrade watson-developer-cloud
i get permission denied, so i tried
sudo pip install --upgrade watson-developer-cloud
then i get

Command "/usr/bin/python -u -c "import setuptools, tokenize;file='/tmp/pip-build-ibctMJ/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(file).read().replace('\r\n', '\n'), file, 'exec'))" install --record /tmp/pip-_kHPhG-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-ibctMJ/cryptography/
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

I updated pip and setuptools to the newest version, but still doesn't work.
Any clue?