$ gem list bundler                                                                                                      

***LOCAL GEMS***

bundler (default: 1.17.3)
capistrano-bundler (2.0.1)
$ ruby --version                                                                                                        
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]
$ bundle _1.17.3_ -v                                                                                                    
Bundler version 2.1.4

为什么bundler声称是2.1.4，而我没有安装它？
这是不是一种强迫我升级的方式，让我的gemfile认为我使用了更新的版本，然后让我继续安装？
还是有我忽略的配置？
更新 gem list bundle -d 返回

***LOCAL GEMS***

bundler (1.17.3)
    Authors: André Arko, Samuel Giddins, Colby Swandale, Hiroshi
    Shibata, David Rodríguez, Grey Baker, Stephanie Morillo, Chris
    Morris, James Wen, Tim Moore, André Medeiros, Jessica Lynn Suttles,
    Terence Lee, Carl Lerche, Yehuda Katz
    Homepage: http://bundler.io
    License: MIT
    Installed at (default): /Users/brandon/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0

    The best way to manage your application's dependencies

capistrano-bundler (2.0.1)
    Authors: Tom Clements, Lee Hambley, Kir Shatrov
    Homepage: https://github.com/capistrano/bundler
    License: MIT
    Installed at: /Users/brandon/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0

    Bundler support for Capistrano 3.x
``` `which bundle` 返回

/Users/brandon/.rbenv/shims/bundle

跑步 `eval "$(rbenv init -)"` 不会改变任何事情。
更新2.1.4以上版本也不能解决问题。无论我安装了什么，我都被告知我正在使用2.1.4：

$ gem install --default bundler:2.2.24
Successfully installed bundler-2.2.24 as a default gem
WARNING: Unable to pull data from 'https://gems.github.com/': bad response Not Found 404 (https://gems.github.com/specs.4.8.gz)
1 gem installed
$ bundler --version
Bundler version 2.1.4