Deployment to heroku not working

[lvmajor]

Here is the message received when trying to deploy to heroku 18:

-----> Ruby app detected
-----> Compiling Ruby/Rails
       Command: 'set -o pipefail; curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/heroku-18/ruby-2.2.4.tgz -s -o - | tar zxf - ' failed on attempt 1 of 3.
       Command: 'set -o pipefail; curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 https://s3-external-1.amazonaws.com/heroku-buildpack-ruby/heroku-18/ruby-2.2.4.tgz -s -o - | tar zxf - ' failed on attempt 2 of 3.
 !
 !     An error occurred while installing ruby-2.2.4
 !     
 !     This version of Ruby is not available on Heroku-18. The minimum supported version
 !     of Ruby on the Heroku-18 stack can found at:
 !     
 !     https://devcenter.heroku.com/articles/ruby-support#supported-runtimes
 !
 !     Push rejected, failed to compile Ruby app.
 !     Push failed

[lvmajor]

I tried updating the ruby version specified in the gem file but it still had other errors related to Json then. I also tried to edit the json version to be in line with the new gems available for it, but then it is required to regenerate the gemfile.lock, which I can't do as I don't have anything related to ruby installed locally.

[pumalife]

I received this error also. Im a novice to Ruby and Heroku. Please fix bug when able :) :) :)