Upgrading Rails

I have updated rails and have rails -v and it says 3.0.5. (which is good) when i open my old programs, will it still always use 3.0.4 as that is what was used?

And .. when i create new one will it use 3.0.5

I have done this as i'm a newbie and having problems with tutorials from the rails by example book michael hartl and wondering if it is the version that is giving the problem开发者_Python百科s.

Thanks for any help..

In Rails 3 Bundler was added to handle gem dependencies. Within each application a Gemfile exists that specifies the version of Rails to use. If you want to update an application change the version in your Gemfile and run bundle install.