We are expecting to release a Redakt version specifically targeting .NET 6 later this year. With .NET 5 nearing the end of support from Microsoft, we will also likely drop .NET 5 support when .NET 6 is in mainstream use. As .NET 6 is a Long-term Support (LTS) version, this will be the main target for Redakt assemblies for the next few years. For future .NET versions (i.e. .NET 7) we will introduce multi-targeting Redakt packages.
As always, you can get the Redakt CMS packages from NuGet.