September 2021 .NET Updates

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

.NET

* [.NET September 2021 Updates – 5.0.10 and 3.1.19](https://devblogs.microsoft.com/dotnet/september-2021-updates/)
* .NET 5.0.10 and .NET SDK 5.0.401 and .NET SDK 5.0.207 ([Release Notes](https://github.com/dotnet/core/blob/main/release-notes/5.0/5.0.10/5.0.10.md) | [Download](https://dotnet.microsoft.com/download/dotnet/5.0))
* .NET Core 3.1.19 and .NET SDK 3.1.413 and NET SDK 3.1.119 ([Release Notes](https://github.com/dotnet/core/blob/main/release-notes/3.1/3.1.19/3.1.19.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)