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由 claudiob 提交于
[This article](http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/#maintenance-consequences-and-rails-5-0) states that: > Rails 5.0 is in most likelihood going to target Ruby 2.2. Before the exact minimum version is fully decided, @arthurnn [suggests](https://github.com/rails/rails/pull/17830#issuecomment-64940383) that **at least** version 2.1.0 **must** be required by the `gemspec` files.
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