It's now used by default to handle image variants. We were getting a warning: DEPRECATION WARNING: Generating image variants will require the image_processing gem in Rails 6.1. Please add `gem 'image_processing', '~> 1.2'` to your Gemfile. Note `mini_magick` is required in order to use the `analyze` method [1]. Since we use it in our image (and site customization image) validations, we're still keeping the explicit dependency in our Gemfile. [1] https://guides.rubyonrails.org/v6.0/active_storage_overview.html#analyzing-files