December 2021 .NET Updates

The following .NET updates were released in December 2021. This issue will be updated if there are any additional releases during the month.

.NET

* [.NET December 2021 Updates – 6.0, 5.0.13 and 3.1.22](https://devblogs.microsoft.com/dotnet/december-2021-updates/)
* .NET 6.0.1 and .NET SDK 6.0.101 ([Release Notes](https://github.com/dotnet/core/blob/main/release-notes/6.0/6.0.1/6.0.1.md) | [Download](https://dotnet.microsoft.com/download/dotnet-core/6.0))
* .NET 5.0.13 and .NET SDK 5.0.404 ([Release Notes](https://github.com/dotnet/core/blob/main/release-notes/5.0/5.0.13/5.0.13.md) | [Download](https://dotnet.microsoft.com/download/dotnet/5.0))
* .NET Core 3.1.22 and .NET SDK 3.1.416 ([Release Notes](https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.22/3.1.22.md) | [Download](https://dotnet.microsoft.com/download/dotnet-core/3.1))

.NET Support Policies

Microsoft support policies are defined in the following documents:

* [Microsoft .NET Support Policy](https://dotnet.microsoft.com/platform/support/policy/)
* [.NET Core OS Lifecycle Policy](https://github.com/dotnet/core/blob/master/os-lifecycle-policy.md)

Start with the issue body and its linked .NET December 2021 update and release-notes pages. Check whether any additional December release needs recording; done would be a complete, accurate list of the month's updates and support-policy links.

Written by the indexing model from the issue text.