Version 4 (V4) of the AWS SDK for .NET has been released\$1

For information about breaking changes and migrating your applications, see the [migration topic](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html).

 [https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html)

# Document history
<a name="document-history"></a>

The following table describes the important changes since the last release of the *AWS SDK for .NET Developer Guide*. For notification about updates to this documentation, you can subscribe to an [RSS feed](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/amazon-aws-sdk-for-net-v4-dev-guide-doc-history.rss).

| Change | Description | Date | 
| --- |--- |--- |
| [What's new](whats-new.md) | Added a note about version 2.0 of the AWS Deploy Tool for .NET CLI. | October 17, 2025 | 
| [AWS OpsWorks](#document-history) | AWS OpsWorks has reached End of Life. It has been removed from the documentation. | September 16, 2025 | 
| [What's new](whats-new.md) | End-of-support has been announced for V3 of the AWS SDK for .NET. | August 21, 2025 | 
| [What's new](whats-new.md) | General availability for the Distributed Cache Provider | July 2, 2025 | 
| [Message Processing Framework](msg-proc-fw.md) | The AWS Message Processing Framework for .NET has reached general availability\$1 | May 5, 2025 | 
| [What's new](whats-new.md) | Version 4 of the AWS SDK for .NET is generally available\$1 For information about migrating your applications to V4, see [Migrating to version 4](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html). | April 28, 2025 | 
| [Migrating to version 4 of the AWS SDK for .NET](net-dg-v4.md) | Included preview information about migraging applications built with the AWS SDK for .NET to version 4. | March 3, 2025 | 
| [Integrating AWS with .NET Aspire in the AWS SDK for .NET](aspire-integrations.md) | Included information about how AWS has been Integrated with .NET Aspire in the AWS SDK for .NET. | February 15, 2025 | 
| [Observability](observability.md) | Announced the GA release for observability | February 10, 2025 | 
| [What's new](whats-new.md) | Added information about new default behavior for integrity protection. | January 15, 2025 | 
| [S3 Encryption Client V4 Migration](s3-encryption-migration-v2-v4.md) | Added information about migrating from V2 to V4. | December 9, 2024 | 
| [What's new](whats-new.md) | Added information about the fourth preview release of the AWS SDK for .NET version 4. | November 15, 2024 |