paperclip/UPGRADING at master · Vydia/paperclip · GitHub

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##################################################
#  NOTE FOR UPGRADING FROM 4.3.0 OR EARLIER      #
##################################################

Paperclip is now compatible with aws-sdk-s3.

If you are using S3 storage, aws-sdk-s3 requires you to make a few small
changes:

* You must set the `s3_region`
* If you are explicitly setting permissions anywhere, such as in an initializer,
  note that the format of the permissions changed from using an underscore to
  using a hyphen. For example, `:public_read` needs to be changed to
  `public-read`.

For a walkthrough of upgrading from 4 to *5* (not 6) and aws-sdk >= 2.0 you can watch
http://rubythursday.com/episodes/ruby-snack-27-upgrade-paperclip-and-aws-sdk-in-prep-for-rails-5