After I updated my Ruby version with rbenv I wasn't able to use the Heroku command-line tool. I got this error:
> heroku
rbenv: heroku: command not found
The `heroku' command exists in these Ruby versions:
2.0.0-p195
Reinstalling the tool belt from toolbelt.heroku.com didn't help.
I switched to my previous Ruby version 2.0.0p195 and uninstalled the gem 'heroku'
rbenv global 2.0.0p195
gem uninstall heroku
Then I switched to the latest Ruby version 2.0.0p353 and reinstalled Toolbelt toolbelt.heroku.com
rbenv global 2.0.0p353