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Rubies 2.2.9, 2.3.6, and 2.4.3 are now available

Change effective on 14 December 2017

Ruby v2.4.3, v2.3.6, v2.2.9 are now available on Heroku. To run your app using a newer version of Ruby, use ruby directive in your Gemfile. For instance, to use Ruby v2.4.3:

ruby "2.4.3"

Unverified accounts now have a concurrent build limit of one Ruby 2.5.0-rc1 now available on Heroku