UPGRADING.md

How to upgrade/downgrade RubyGems and Bundler:

Upgrade Recipe

$ gem update --system

$ gem install bundler
$ bundle update --bundler

Downgrade Recipe

$ gem update --system 4.0.20

$ gem install bundler -v 4.0.20
$ bundle update --bundler=4.0.20

Install a pre-release version

$ gem update --system --pre

$ gem install bundler --pre
$ bundle update --bundler=4.0.0.beta1

Install from source

• Download from: https://rubygems.org/pages/download
• Unpack into a directory and cd there
• Install with: ruby setup.rb