zsh
sudo gem update --system
したんですが gem 2.1.11が入っちゃいました。
zsh
gem list rubygems-update
sudo gem install -v 2.1.0 rubygems-update
sudo gem uninstall -v 2.1.11 rubygems-update
sudo update_rubygems
これで晴れてgem2.1.0環境です
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