# 13.0 Upgrade Guide

[Release notes](https://github.com/AutoMapper/AutoMapper/releases/tag/v13.0.0).

## AutoMapper now targets .Net 6

## `AddAutoMapper` is part of the core package and the DI package is discontinued

## `AllowAdditiveTypeMapCreation` was removed

Be sure to call `CreateMap` once for a source type, destination type pair. If you want to reuse configuration, use mapping inheritance.

## ProjectTo runtime polymorphic mapping with Include/IncludeBase

We consider this an off the beaten path feature and we don't expose it through `CreateProjection`. You can use [an extension method](https://github.com/AutoMapper/AutoMapper/search?l=C%23&q=Advanced) or `CreateMap`.

## `Context.State` similar to `Context.Items`

The same pattern the framework uses to pass state to delegates. Note that `State` and `Items` are mutually exclusive per `Map` call.

## Custom Equals/GetHashCode for source objects

To avoid broken implementations, we no longer call those when checking for identical source objects, we hard code to checking object references.