DeployGateのdgコマンドを打つとエラーになってしまう

Question

前提・実現したいこと

こちらを参考にDeployGateのdgコマンドのインストールを行いましたが
下記のエラーが出てしまいます。調べたことを試してみましたが
解決出来なかったため、ご教示頂けると幸いです。
恐縮ですが宜しくお願い致します。

発生している問題・エラーメッセージ

$ dg deploy
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/specification.rb:2288:in `raise_if_conflicts': Unable to activate fastlane-2.125.2, because multipart-post-2.1.1 conflicts with multipart-post (~> 2.0.0), public_suffix-3.1.0 conflicts with public_suffix (~> 2.0.0), highline-2.0.2 conflicts with highline (< 2.0.0, >= 1.7.2) (Gem::ConflictError)
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/specification.rb:1411:in `activate'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems.rb:196:in `rescue in try_activate'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems.rb:193:in `try_activate'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:125:in `rescue in require'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:39:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/deploygate-0.7.0/lib/deploygate.rb:30:in `<top (required)>'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/deploygate-0.7.0/bin/dg:4:in `<top (required)>'
	from /usr/local/bin/dg:22:in `load'
	from /usr/local/bin/dg:22:in `<main>'

コマンド

curl -sSL https://deploygate.com/cli/install/0ee95962 | bash
Welcome to DeployGate!

         _            _                       _
        | |          | |                     | |
      __| | ___  ___ | | ___ _   ,____   ___ | |_ ___
     / _` |/ _ \' _ \| |/ _ \ \ / / _ \ / _ `| __/ _ \
    | (_| |  __/ |_) | | (_) \ v / (_| | (_| | |_' __/
     \___, \___| .__/|_|\___/ ` / \__, |\__,_|\__\___`
               |_|           /_/  |___/


Superuser access (sudo) required
Please type your login password to grant installing dg command to your system.

Password:

Installing dg with "sudo gem install deploygate --no-document".

This may take a while. It's a good time to grab some coffee ☕️


dg installed! To get started fast:

  $ dg deploy

Successfully installed deploygate-0.7.0
1 gem installed

試したこと

gem cleanup コマンドを試しましたが、エラーの内容は変わりませんでした。