Deploy to Heroku CircleCI step To make it working generate a new SSH private-public key pair register the public key to your Heroku account add the private key to CircleCI, to allow it publishing Useful guides: https://devcenter.heroku.com/articles/keys https://circleci.com/docs/2.0/add-ssh-key/ https://www.ssh.com/ssh/public-key-authentication CircleCI Steps