Hub: How to upgrade 'hub' ?

[VincentSim]

Hi,

Here is my issue:
I upgrade my ruby version to ruby 2.2.3p173
After that each command :

hub create

or

brew upgrade hub --HEAD

give

rbenv: hub: command not found

The `hub' command exists in these Ruby versions:
  2.1.2

[mislav]

You should uninstall the "hub" gem:

RBENV_VERSION=2.1.2 gem uninstall -x hub
rbenv rehash

Then, confirm that Homebrew hub is the only installation remaining:

which -a hub
#=> /usr/local/bin/hub

Then you should be good!