title: 1.9.3 installed, error message factory_girl requires Ruby version >= 1.9.2
body: <p>I just installed rbenv with ruby 1.9.3</p>
  
  <pre><code>rbenv version
  1.9.3-p327 (set by /Users/me/.rbenv/version)
  </code></pre>
  
  <p>However, when I tried to run bundle update (inside a project that was created before rbenv was installed), I got an error message that factory_girl required at least ruby 1.9.2. See error message below</p>
  
  <p>If it's relevant, when I do gem --version, I see a reference to 1.8.23. </p>
  
  <pre><code>gem --version
  1.8.23
  </code></pre>
  
  <p>Error message</p>
  
  <pre><code>Installing factory_girl (4.1.0) /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems/installer.rb:163:in `install': factory_girl requires Ruby version &gt;= 1.9.2. (Gem::InstallError)
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/source.rb:101:in `install'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/rubygems_integration.rb:78:in `preserve_paths'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/source.rb:91:in `install'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/installer.rb:58:in `run'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/rubygems_integration.rb:93:in `with_build_args'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/installer.rb:57:in `run'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/installer.rb:49:in `run'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/installer.rb:8:in `install'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/cli.rb:268:in `update'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/vendor/thor/task.rb:22:in `send'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/vendor/thor/task.rb:22:in `run'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/vendor/thor.rb:263:in `dispatch'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/lib/bundler/vendor/thor/base.rb:386:in `start'
      from /Library/Ruby/Gems/1.8/gems/bundler-1.0.18/bin/bundle:13
      from /usr/bin/bundle:19:in `load'
      from /usr/bin/bundle:19
  </code></pre>
  
  <p>Update:</p>
  
  <p>The first answer told me to do three steps</p>
  
  <pre><code>gem install bundle
  rbenv rehash
  bundle install
  </code></pre>
  
  <p>I did those steps (it installed bundler) '</p>
  
  <pre><code>gem install bundler
  Fetching: bundler-1.2.3.gem (100%)
  Successfully installed bundler-1.2.3
  1 gem installed
  </code></pre>
  
  <p>but when I tried 'bundle install, I got the same error message about Factory_girl. Interestingly, I decided to try those three steps again, beginning with gem install bunlder, and it installed it again?!#??</p>