rbenv工作,但ruby版本不变

❯ rbenv version
system (set by /Users/eric.nguyen/.rbenv/version)
                                                                                                                                                             
❯ rbenv local 2.4.2
                                                                                                                                                           

❯ gem install bundler
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
                                                                                                                                                           
❯ rbenv global 2.4.2
                                                                                                                                                           
❯ ruby -v
ruby 2.0.0p648 (2015-12-16 revision 53162) [universal.x86_64-darwin16]
                                                                                                                                                           
❯ rbenv version
2.4.2 (set by /Users/eric.nguyen/.ruby-version)
                                                                                                                                                           
❯ gem install bundler
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
                                                                                                                                                           
❯ gem -v
2.0.14.1

Ruby版本仍然是2.0.0p648

我在macOS Sierra 10.12.6上。
我已经做了上面提到的一切 here

我做了:

1. rbenv rehash
2. 放 eval "$(rbenv init -)" 在我的。zshrc和 source ~/.zshrc
3. 放 $HOME/.rbenv/shims 进入$PATH(/Users/eric.nguyen/.rbenv/shimms:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/Users/eric.nguyen/Library/Android/sdk/tools:/Users/eric.nguyen/Library/Android/sdk/platform tools:/Users/eric.nguyen/.rbenv/shimms)

但它仍然没有改变ruby版本。