1.9.3安装，错误信息factory_girl需要Ruby版本> = 1.9.2

我刚刚用ruby 1.9.3安装了rbenv

rbenv version
1.9.3-p327 (set by /Users/me/.rbenv/version)

但是，当我尝试运行bundle update时（在安装rbenv之前创建的项目中），我收到一条错误消息，即factory_girl至少需要ruby 1.9.2 . 请参阅下面的错误消息

如果它是相关的，当我做gem --version时，我看到对1.8.23的引用 .

gem --version
1.8.23

错误信息

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 >= 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

更新：

第一个答案告诉我要做三个步骤

gem install bundle
rbenv rehash
bundle install

我做了那些步骤（它安装了捆绑器）'

gem install bundler
Fetching: bundler-1.2.3.gem (100%)
Successfully installed bundler-1.2.3
1 gem installed

但当我尝试'捆绑安装时，我得到了关于Factory_girl的相同错误消息 . 有趣的是，我决定再次尝试这三个步骤，从gem install bunlder开始，再次安装它？！＃??