Installing Spree on Dreamhost

I’m trying to install Spree on my DreamHost account. Spree is an e-Commerce system in Ruby on Rails.

However, for it to properly install, I need RubyGems 1.3.6, and as you all know, installed is 1.3.5

My question is: is it possible to install RubyGems 1.3.6 on my account (maybe with the help of a moderator)? Otherwise, is it possible to install it by using a workaround to act as though I have that version?
And if all else fails: is there another great open-source Ruby-based e-Commerce system available?

Help is appreciated!

Maybe with RVM you can accomplish. But you have to know if is possible to install on Dreamhost.
Has Someone a spree site on Dreamhost?