If you use rails_admin, your specs pass with the rspec binary, but not using rake spec (or rake parallel:spec etc), put this at the top of your spec_helper:

ENV['SKIP_RAILS_ADMIN_INITIALIZER'] = 'false'

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

Read more Show archive.org snapshot

Don't ask.

This is probably also true for cucumber, your env.rb would be the right place.