That page covers a number of upgrade scenarios, the section for upgrading from 4.2 to 5.0 only has three entries[1], one of which is optional.<p>[1] <a href="http:&#x2F;&#x2F;edgeguides.rubyonrails.org&#x2F;upgrading_ruby_on_rails.html#upgrading-from-rails-4-2-to-rails-5-0" rel="nofollow">http:&#x2F;&#x2F;edgeguides.rubyonrails.org&#x2F;upgrading_ruby_on_rails.ht...</a>