[Locomotive-users] How to update ruby?

[Paulo Abreu]

Hi There!

In locomotive website we can read:

"(...) Locomotive uses "Bundles", each of which is a self-contained  
installation of Ruby, Rails, and all the necessary support software  
and libraries (as well as many useful optional tools!)."

How do I update ruby on locomotive? I would like to use 1.8.5 ruby  
version.

Thank you for your attention,

Paulo Abreu