What's new in the AWS SDK for .NET - AWS SDK for .NET (V3)
This documentation is a draft for private preview for regions in the AWS European Sovereign Cloud. Documentation content will continue to evolve. Published: January 1, 2026.

Version 4 (V4) of the AWS SDK for .NET has been released!

To start using the new version of the SDK, see the AWS SDK for .NET (V4) Developer Guide, especially the topic for Migrating to version 4.

What's new in the AWS SDK for .NET

For high-level information about new developments related to the AWS SDK for .NET see the product page at https://www.aws.eu/sdk-for-net/ and the SDK change logs.

The following is what's new in the AWS SDK for .NET.

August 21, 2025: Upcoming end-of-support for version 3 of the AWS SDK for .NET

The end-of-support for this version (V3) of the AWS SDK for .NET has been announced. See the V4 migration guide to migrate your V3 applications and avoid disruptions. For more information, see the blog post Announcing the end-of-support for the AWS SDK for .NET v3.

April 28, 2025: Version 4 of the AWS SDK for .NET

Version 4 of the AWS SDK for .NET is generally available! For more information, see the AWS SDK for .NET (V4) Developer Guide, especially the topic for Migrating to version 4.

February 10, 2025: GA release for observability

Observability is the extent to which a system's current state can be inferred from the data it emits. Observability has been added to the AWS SDK for .NET, including an implementation of a telemetry provider. For more information, see Observability in this guide and the blog post Announcing the general availability of AWS .NET OpenTelemetry libraries.

January 15, 2025: New default behavior for integrity protection

Beginning with version 3.7.412.0 of the AWS SDK for .NET, the SDK provides default integrity protections by automatically calculating a CRC32 checksum for uploads. For more information, see the announcement on GitHub at https://github.com/aws/aws-sdk-net/issues/3610. The SDK also provides global settings for data integrity protections that you can set externally, which you can read about in Data Integrity Protections in the AWS SDKs and Tools Reference Guide.

November 15, 2024: Blog post for preview 4 release for version 4

Preview 4 of the AWS SDK for .NET Version 4 was released on November 15, 2024. For more information about this preview, see the blog post Preview 4 of AWS SDK for .NET V4.

August 16, 2024: Blog post for preview 1 release for version 4

The AWS SDK for .NET Version 4 was released as a first preview on August 16, 2024. For more information about this preview, see the blog post Preview 1 of AWS SDK for .NET V4.

February 23, 2024: Added support for .NET 8

Support for .NET 8 was added to the AWS SDK for .NET. Use the latest NuGet packages or the assemblies that support .NET 8 and later. You can find additional information about this support, including support for Lambda in the blog post .NET 8 Support on AWS.

February 18, 2024: Upcoming changes to .NET Framework support

Starting August 15th, 2024, the AWS SDK for .NET will end support for .NET Framework 3.5 and will change the minimum .NET Framework version to 4.7.2. For more information, see the blog post Important changes coming for .NET Framework 3.5 and 4.5 targets of the AWS SDK for .NET.

2023-07-17: The AWS Lambda Annotations framework has been released for general availability

The AWS Lambda Annotations framework makes the experience of writing Lambda functions in C# feel more natural for .NET developers by using C# source generator technology. It is now generally available.

2020-08-24: Version 3.5 of the SDK has been released

  • Standardized the .NET experience by transitioning support for all non-Framework variations of the SDK to .NET Standard 2.0. See Migrating to version 3.5 for more information.

  • Added paginators to many service clients, which make pagination of API results more convenient. For more information, see Paginators.