If you want to read up on how Github transitioned, this post is useful: http://shayfrendt.com/posts/upgrading-github-to-rails-3-with-zero-downtime/ http://shayf

If you want to read up on how Github transitioned, this post is useful: http://shayfrendt.com/posts/upgrading-github-to-rails-3-with-zero-downtime/ http://shayfrendt.com/posts/upgrading-github-to-rails-3-with... Getting stuck on 2.3 isn't desirable.