Loadpath question

Im installed gems on a custom gem path indicated by GEM_HOME.

I updated rails to 1.1.2 via gem install rails --include-dependencies

then rails -v
Rails 1.1.2

but un a webapp via dispatch.rb through apache cgi, got rails 1.1.1 and
dependencies.

Where can be the loadpath to retrieve rails 1.1.1 when I need rails
1.1.2?

thanks

P