将rails版本4.0.3更新为4.2

Question

当我执行捆绑命令时，我得到以下内容：

You have requested:
rails = 4.2.0

The bundle currently has rails locked at 4.0.3.
Try running `bundle update rails`

然后当我做“捆绑更新导轨”时：

Bundler could not find compatible versions for gem "activesupport":
  In Gemfile:
    rails (= 4.2.0) ruby depends on
      activesupport (= 4.2.0) ruby

    rails (= 4.2.0) ruby depends on
      actionmailer (= 4.2.0) ruby depends on
        rails-dom-testing (>= 1.0.5, ~> 1.0) ruby depends on
          activesupport (4.2.0.beta1)

这是我的Gemfile：

source 'https://rubygems.org'
source 'https://rails-assets.org'

ruby '2.1.0'

gem 'rails', '4.2.0'

我真的不明白发生了什么。任何帮助都会很棒！

感谢。

Answer 1

在升级rails时，您似乎还需要更新gem rails-dom-testing。

bundle update rails rails-dom-testing