Невозможно активировать rails 3.0.1 из-за конфликта версий сборщика

поэтому я запускаю:

$ gem install rails --version 3.0.1

Successfully installed rails-3.0.1
1 gem installed
Installing ri documentation for rails-3.0.1...
Installing RDoc documentation for rails-3.0.1...

затем получаю сообщение об ошибке:

$ rails -v
/usr/local/rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:1637:in `raise_if_conflicts': Unable to activate rails-3.0.1, because bundler-1.1.4 conflicts with bundler (~> 1.0.0) (Gem::LoadError)
from /usr/local/rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/specification.rb:746:in `activate'
from /usr/local/rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems.rb:1232:in `gem'
from /usr/local/rvm/gems/ruby-1.9.3-p125@rails3tutorial/bin/rails:18:in `<main>'
from /usr/local/rvm/gems/ruby-1.9.3-p125@rails3tutorial/bin/ruby_noexec_wrapper:14:in `eval'
from /usr/local/rvm/gems/ruby-1.9.3-p125@rails3tutorial/bin/ruby_noexec_wrapper:14:in `<main>'