How can I choose Ruby version on Heroku?

Question

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?

Answer 1

You can now explicitly specify a Ruby version on Heroku.

Simply setup your Gemfile as so

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

# Gems go here