Heroku_can't upgrade to Cedar-14

Question

As requested on Heroku, I am trying to upgrade from Cedar-10 to Cedar-14, but in vain. On my console, When I execute

heroku stack:set cedar-14

Answer 1

It looks like your current heroku version isn't up to date.

Things you can try:

heroku update

If that doesn't work

gem uninstall heroku

Reinstall the gem or the heroku toolbelt

If that doesn't work:

which heroku

Delete the executable at the path listed by the above mentioned command

After that reinstall the heroku toolbelt

For more info check: https://devcenter.heroku.com/articles/heroku-command