如何升級導軌？

請幫助升級導軌。現在我有版本3.2.21。但我需要安裝版本4如何升級導軌？

我嘗試添加的Gemfile：

gem 'rails', '4.2.1'

，並執行：

bundle install

，但我收到以下錯誤消息：

[email protected] ~/rails/project1 $ bundle install 
Fetching gem metadata from https://rubygems.org/........... 
Fetching gem metadata from https://rubygems.org/.. 
Resolving dependencies... 
Bundler could not find compatible versions for gem "activesupport": 
    In snapshot (Gemfile.lock): 
    activesupport (3.2.21) 

    In Gemfile: 
    rails (= 4.2.1) ruby depends on 
     activesupport (= 4.2.1) ruby 

Running `bundle update` will rebuild your snapshot from scratch, using only 
the gems in your Gemfile, which may resolve the conflict.

ps：

[email protected] ~/rails/project1 $ bundle update 
Fetching gem metadata from https://rubygems.org/........... 
Fetching gem metadata from https://rubygems.org/.. 
Resolving dependencies... 
Bundler could not find compatible versions for gem "railties": 
    In Gemfile: 
    coffee-rails (~> 3.2.1) ruby depends on 
     railties (~> 3.2.0.beta) ruby 

    rails (= 4.2.1) ruby depends on 
     railties (4.2.1)

來源

2015-05-05 stackow6

閱讀相關信息！ *運行'bundle update'會從頭開始重建你的快照，只使用Gemfile中的gem，這可能會解決衝突。* –

運行

包更新

然後，做

捆綁安裝

應該修復。

來源

2015-05-05 09:46:42

，或者您也可以運行此命令：

包更新軌道

來源

2015-05-05 09:55:38

如何升級導軌？

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