Akka.NET v1.4.32 is a minor release that contains some API improvements. Most of the changes have been aimed at improving our web documentation and code cleanup to modernize some of our code. One big improvement in this version release is the Hyperion serialization update. Hyperion 0.12.0 introduces a new deserialization security mechanism to allow users to selectively filter allowed types during deserialization to prevent deserialization of untrusted data described [here](https://cwe.mitre.org/data/definitions/502.html). This new feature is exposed in Akka.NET in HOCON through the new [`akka.actor.serialization-settings.hyperion.allowed-types`](https://github.com/akkadotnet/akka.net/blob/dev/src/contrib/serializers/Akka.Serialization.Hyperion/reference.conf#L33-L35) settings or programmatically through the new `WithTypeFilter` method in the `HyperionSerializerSetup` class. The simplest way to programmatically describe the type filter is to use the convenience class `TypeFilterBuilder`: ```c# var typeFilter = TypeFilterBuilder.Create() .Include<AllowedClassA>() .Include<AllowedClassB>() .Build(); var setup = HyperionSerializerSetup.Default .WithTypeFilter(typeFilter); ``` You can also create your own implementation of `ITypeFilter` and pass an instance of it into the `WithTypeFilter` method. For complete documentation, please read the Hyperion [readme on filtering types for secure deserialization.](https://github.com/akkadotnet/Hyperion#whitelisting-types-on-deserialization) [Akka.Streams: Added Flow.LazyInitAsync and Sink.LazyInitSink to replace Sink.LazyInit](https://github.com/akkadotnet/akka.net/pull/5476) [Akka.Serialization.Hyperion: Implement the new ITypeFilter security feature](https://github.com/akkadotnet/akka.net/pull/5510) If you want to see the [full set of changes made in Akka.NET v1.4.32, click here](https://github.com/akkadotnet/akka.net/milestone/63). | COMMITS | LOC+ | LOC- | AUTHOR | | --- | --- | --- | --- | | 11 | 1752 | 511 | Aaron Stannard | | 8 | 1433 | 534 | Gregorius Soedharmo | | 3 | 754 | 222 | Ismael Hamed | | 2 | 3 | 6 | Brah McDude | | 2 | 227 | 124 | Ebere Abanonu | | 1 | 331 | 331 | Sean Killeen | | 1 | 1 | 1 | TangkasOka |