If you used ValueObjects then you need to migrate them to Models. This will be very easy if you used the ValueObject with a Definition.Keys definition, which is most likely the case.
Before:
class User < Definition::ValueObject
definition(Definition.Keys do
required :username, Definition.Type(String)
required :password, Definition.Type(String)
end)
endAfter:
class User < Definition::Model
required :username, Definition.Type(String)
required :password, Definition.Type(String)
endIf you use the Definition.CoercibleValueObject definition in your models, you just need to replace those with a Definition.CoercibleModel definition.
If you use ValueObjects that do not use a Keys definition then there is currently no built in replacement available.