What's new in the AWS SDK for .NET - AWS SDK for .NET (V4)
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!

For information about breaking changes and migrating your applications, see the migration topic.

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 version 3 (V3) of the AWS SDK for .NET has been announced. See the 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 information about migrating your applications to V4, see Migrating to version 4. Also see the blog post General Availability of AWS SDK for .NET V4.0 that announces general availability.

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.