# Update to Rails 4

In order to update Ontohub to Rails 4 we need to know the breaking changes.

Here is a guide to use for upgrading:

[Railsguides](http://guides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-3-2-to-rails-4-0)

[Railscast](http://railscasts.com/episodes/415-upgrading-to-rails-4)