Uninstall Old Version? [Solved]

Hi all, I just installed middleman --pre because I am running Ruby 2.0 and after the gem installed completed I tried running middleman version to see if it updated but I get error saying

/Users/ryan/.rvm/rubies/ruby-2.0.0-p0/lib/ruby/site_ruby/2.0.0/rubygems/specification.rb:1990:in `raise_if_conflicts': Unable to activate middleman-blog-3.1.1, because middleman-core-3.1.0.rc.2 conflicts with middleman-core (~> 3.0.1) (Gem::LoadError)

Do I need to uninstall the old version? If so, how do I do that?

Thank you much.

The following will remove all older versions:

gem cleanup

or more specifically:

gem uninstall middleman-core

And it will ask you which ones to remove.

Sweet thanks, I was able to uninstall the old versions and just run the pre.