从Heroku中排除hoe gem依赖项

我正试图将代码推送到Heroku，看起来系统gem“hoe”不知何故被其他gem包含（geokit是其中之一，但即使从Gemfile中删除该gem，也没有运气）。这导致Heroku失败，因为它无法更新系统gems。如何解决这个问题

Installing geokit (1.5.0) 
   Installing geonames (0.2.2) 
   Installing hoe (2.9.1) /usr/ruby1.8.7/lib/ruby/site_ruby/1.8/rubygems/installer.rb:170:in `install': hoe requires RubyGems version >= 1.4. Try 'gem update --system' to update RubyGems itself. (Gem::InstallError)
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/source.rb:95:in `install'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:55:in `run'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/spec_set.rb:12:in `each'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:44:in `run'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/installer.rb:8:in `install'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/cli.rb:225:in `install'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/task.rb:22:in `send'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/task.rb:22:in `run'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/invocation.rb:118:in `invoke_task'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor.rb:246:in `dispatch'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/lib/bundler/vendor/thor/base.rb:389:in `start'
    from /usr/ruby1.8.7/lib/ruby/gems/1.8/gems/bundler-1.0.7/bin/bundle:13
    from /usr/ruby1.8.7/bin/bundle:19:in `load'
    from /usr/ruby1.8.7/bin/bundle:19
   FAILED: http://devcenter.heroku.com/articles/bundler

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!！Heroku push被拒绝，无法通过Bundler安装gems

只需将其固定在Gemfile中，我打赌您的从属gems不依赖于2.9.1。添加以下内容：

gem 'hoe', '~> 1.5.1' # Heroku's rubygems is too old for hoe 2.9.1 as of 28 Mar 2011