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Asked: 2026-05-16T17:14:16+00:00

I use Ruby 1.9.x syntax in my Rails 3 app, but after pushing it

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I use Ruby 1.9.x syntax in my Rails 3 app, but after pushing it to Heroku it crashes due to older Ruby version (1.8). How can I control it?

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  1. Editorial Team

    Heroku’s current stack, Cedar, uses 1.9.2 by default. Cedar also supports specifying the Ruby version in your Gemfile. Currently, 1.9.2 and 1.9.3 are valid options.

    # Gemfile
source "https://rubygems.org"
ruby "1.9.3"
...

    More details are available in the Ruby support article: https://devcenter.heroku.com/articles/ruby-support

    If you are currently using Aspen or Bamboo, you can switch to 1.9.2 by using the stack:migrate command:

    $ heroku stack:migrate bamboo-mri-1.9.2

    You cannot automatically migrate to the Cedar stack at this time, but there is a guide on how to do so: https://devcenter.heroku.com/articles/cedar-migration

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