Recommended migration steps from :single_iv_and_salt to :per_attribute_iv

[Juraci]

Reading through the README I saw this note:

NOTE: :per_attribute_iv_and_salt and :single_iv_and_salt modes are deprecated and will be removed in the next major release

We are trying to be proactive and move away from the deprecated modes.
Since our current configuration looks like this:

attr_encrypted :some_attribute,
key: secret_key,
algorithm: "aes-256-cbc",                                                                                                                                                                                                                                                                                                                                                                                               
mode: :single_iv_and_salt,
insecure_mode: true

What would be the steps necessary to migrate the existing records to the default and recommended mode :per_attribute_iv ?

Ruby version 2.5.5-p157
Rails version 5.2.4.2
Gem version 3.1.0

[natpicone]

Any update on this topic?