ActiveRecord#update and ActiveRecord#update! were added as aliases for update_attributes and update_attributes! in Rails 4 This soft deprecation was added to align with other Active Record methods like create and provide better semantics when resource is being updated. Using update_attributes didn’t give any deprecation warning until Rails 5.2.

Rails 6 deprecates update_attributes and update_attributes! in favor of update and update! and we can now see deprecation warning when invoked.

#### In Rails 6

Removing these methods will break code in many gems as lot of developers have used update_attributes over update. With this deprecation warning, everyone can start using preferred way of updating record i.e. update. The methods update_attributes and update_attributes! will be removed entirely in the next version, Rails 6.1.