Though we ended up switching to what I consider to be a technically superior product based on simplicity, we arrived there because of poor community interaction on the part of the Bundler developers.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

Prevents you from data breaches and liability risks
Upgrade at your own pace
Works with modern Rubies

From Bundler to Open and Inclusive Software Communities : Steven R. Baker

Rails Long Term Support