$ Bourbon install (Sass) - Ubuntu

My OS is ubuntu, and I'm having trouble installing Bourbon I'm pasting what I see on my command line. Hopefully someone can help me. Am I missing something? Thanks!

$ bourbon install /usr/lib/ruby/vendor_ruby/1.8/rubygems/dependency.rb:247:in to_specs': Could not find bourbon (>= 0) amongst [actionmailer-4.0.2, actionpack-4.0.2, activemodel-4.0.2, activerecord-4.0.2, activerecord-deprecated_finders-1.0.3, activesupport-4.0.2, arel-4.0.1, atomic-1.1.14, bigdecimal-1.1.0, builder-3.1.4, bundler-1.3.5, bundler-unload-1.0.2, coffee-rails-4.0.1, coffee-script-2.2.0, coffee-script-source-1.6.3, erubis-2.7.0, execjs-2.0.2, executable-hooks-1.2.6, gem-wrappers-1.2.1, hike-1.2.3, i18n-0.6.9, io-console-0.3, jbuilder-1.5.3, jquery-rails-3.0.4, json-1.8.1, json-1.5.5, mail-2.5.4, mime-types-1.25.1, minitest-4.7.5, minitest-2.5.1, multi_json-1.8.2, polyglot-0.3.3, rack-1.5.2, rack-test-0.6.2, rails-4.0.2, railties-4.0.2, rake-10.1.1, rake-0.9.2.2, rdoc-3.12.2, rdoc-3.9.5, rubygems-bundler-1.4.2, rvm-1.11.3.8, sass-3.2.13, sass-rails-4.0.1, sdoc-0.3.20, sprockets-2.10.1, sprockets-rails-2.0.1, sqlite3-1.3.8, thor-0.18.1, thread_safe-0.1.3, tilt-1.4.1, treetop-1.4.15, turbolinks-2.1.0, tzinfo-0.3.38, uglifier-2.4.0] (Gem::LoadError) from /usr/lib/ruby/vendor_ruby/1.8/rubygems/dependency.rb:256:into_spec' from /usr/lib/ruby/vendor_ruby/1.8/rubygems.rb:1208:in `gem' from /usr/local/bin/bourbon:18