cannot load such file — bundler/setup (LoadError)

大概有近一年没有加新的gem包，什么都没动就是加了2个gem，bundle install 就报错了。
花了不少时间，原来是gem版本低了，要升级。开源的软件，有条件的话，还是早点升级好。

ion/releases/20210516135724$ ~/.rvm/bin/rvm ruby-2.6.3@persimmon do bundle install
Traceback (most recent call last):
	22: from /home/deploy/.rvm/rubies/ruby-2.6.3/bin/bundle:23:in `<main>'
	21: from /home/deploy/.rvm/rubies/ruby-2.6.3/bin/bundle:23:in `load'
	20: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bundler-1.17.2/exe/bundle:22:in `<top (required)>'
	19: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/friendly_errors.rb:124:in `with_friendly_errors'
	18: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/bundler-1.17.2/exe/bundle:30:in `block in <top (required)>'
	17: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:18:in `start'
	16: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
	15: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:27:in `dispatch'
	14: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
	13: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
	12: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
	11: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:234:in `install'
	10: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/settings.rb:143:in `temporary'
	 9: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli.rb:235:in `block in install'
	 8: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/cli/install.rb:53:in `run'
	 7: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 6: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 5: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/fetcher.rb:3:in `<top (required)>'
	 4: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 3: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 2: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/bundler/vendored_persistent.rb:18:in `<top (required)>'
	 1: from /home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/home/deploy/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- bundler/vendor/net-http-persistent/lib/net/http/persistent (LoadError)

After spend a lot time, trying follow these answers actually after code below it worked for me. Before do it just but be sure that there is no problem in update :)

gem update --system

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