How to update the existing application to new rails version?

[Prabhakar Karve]

I have a rails application created with an earlier version of Rails. I
would like to take benefit of new features in Rails version 2.2.2 Is
there a way or command by which the configuration settings of the
existing application can be updated as per needs of newer version of
rails? I understand that making any changes to the code would be my
responsibility.
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[Simon Macneall]

Just run rake rails:update in your application folder.

I have done it for our app and it was pretty painless.

Simon