The AWS SDK for .NET V3 has entered maintenance mode. We recommend that you migrate to [AWS SDK for .NET V4](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/welcome.html). For additional details and information on how to migrate, please refer to our [maintenance mode announcement](https://aws.amazon.com/blogs/developer/aws-sdk-for-net-v3-maintenance-mode-announcement/). # Document history 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/v3/developer-guide/amazon-aws-sdk-for-net-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 | | [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 more information, see the [AWS SDK for .NET (V4) Developer Guide](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/welcome.html), especially the topic for [Migrating to version 4](https://docs.aws.amazon.com/sdk-for-net/v4/developer-guide/net-dg-v4.html). | April 28, 2025 | | [Retries and timeouts](retries-timeouts.md) | Included information about per-method timeouts using `CancellationToken` for asynchronous method calls. | April 9, 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 | | [Observability](observability.md) | Added preview information about observability in the AWS SDK for .NET, which enables the gathering of telemetry data. | September 13, 2024 | | [API reference for the AWS SDK for .NET](sdk-api-ref.md) | The AWS SDK for .NET API references for V1 and V2 have been deprecated. Information has been included about this deprecation and how to obtain and view the deprecated references. | September 4, 2024 | | [What's new](whats-new.md) | Added information about the first preview release of the AWS SDK for .NET version 4. | August 16, 2024 | | [What's new](whats-new.md) | Updated information about upcoming changes to .NET Framework support. | June 20, 2024 | | [What's new](whats-new.md) | Added information about the preview release of the AWS Message Processing Framework for .NET | March 28, 2024 | | [What's new](whats-new.md) | Included information about support for .NET 8. | February 23, 2024 | | [What's new](whats-new.md) | Included information about upcoming changes to .NET Framework support. | February 18, 2024 | | [Obtaining AWSSDK assemblies](net-dg-obtain-assemblies.md) | Included information about assemblies that support .NET 8 and later. | January 8, 2024 | | [AWS Message Processing Framework for .NET](msg-proc-fw.md) | Included information about the Beta release of the Message Processing Framework. | December 10, 2023 | | [Using Amazon DynamoDB NoSQL databases](dynamodb-intro.md) | Updated information about the document and object persistence programming models. It is now possible to prevent certain latency or deadlock conditions due to cold-start and thread-pool behaviors. | November 15, 2023 | | [Included more IAM best practices updates](#document-history) | Updated guide to align with the IAM best practices. For more information, see [Security best practices in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html). | October 5, 2023 | | [Obtaining AWSSDK assemblies](net-dg-obtain-assemblies.md) | Removed information about installing the AWS SDK for .NET by using AWS Tools for Windows installer (that is, the MSI), which has been deprecated. | September 25, 2023 | | [IAM best practices updates](#document-history) | Updated guide to align with the IAM best practices. For more information, see [Security best practices in IAM](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html). | July 18, 2023 | | [Lambda Annotations](aws-lambda-annotations.md) | The AWS Lambda Annotations framework has been released for general availability. | July 17, 2023 | | [What's new](whats-new.md) | Added information about the preview release of the Distributed Cache Provider for DynamoDB. | July 15, 2023 | | [Table of contents](#document-history) | Updated table of contents to make code examples more easily discoverable. | June 8, 2023 | | [Region resolution](net-dg-region-selection.md) | Added information about how the SDK resolves a missing Region specification. | March 14, 2023 | | [Support for the MSI](net-dg-obtain-assemblies.md) | Added note about ending support for the AWS Tools for Windows installer. | March 6, 2023 | | [Lambda Annotations (Preview)](aws-lambda-annotations.md) | Preview of the AWS Lambda Annotations framework. | September 22, 2022 | | [Deploy applications to AWS](deploying.md) | Moved main content to a GitHub Pages site: https://aws.github.io/aws-dotnet-deploy/ | June 28, 2022 | | [Retiring EC2-Classic](#document-history) | Added notes about retiring EC2-Classic. | April 13, 2022 | | [Single sign-on with the AWS SDK for .NET](sso.md) | Added information about single sign-on (SSO) when using the AWS SDK for .NET. | March 17, 2022 | | [Enforcing a minimum TLS version](enforcing-tls.md) | Added information about TLS 1.3. | March 16, 2022 | | [Work with AWS services](working-with-aws-services.md) | Included lists of the code examples that are available on GitHub. | February 28, 2022 | | [Enabling SDK Metrics](#document-history) | Removed information about enabling SDK metrics, which has been deprecated. | January 20, 2022 | | [Deploy applications to AWS](deploying.md) | Added a reference to the AWS Toolkit for Visual Studio, which provides deployment functionality that is similar to the AWS Deploy Tool. | October 26, 2021 | | [AWS SDK for .NET version 3 guide consolidation](#document-history) | The two AWS SDK for .NET version 3 developer guides, "V3" and "latest", have been consolidated into one guide under the "v3" URL. | August 18, 2021 | | [Migrating from .NET Standard 1.3](migration-from-net-standard-1-3.md) | Support for .NET Standard 1.3 on the AWS SDK for .NET has come to its end of life. | March 25, 2021 | | [Deploy applications to AWS (preview)](deploying.md) | Added preview information about the AWS Deploy Tool, which you can use to deploy an application from the .NET CLI. | March 15, 2021 | | [Version 3.5 of the AWS SDK for .NET](net-dg-v35.md) | Version 3.5 of the AWS SDK for .NET has been released. | August 25, 2020 | | [Paginators](paginators.md) | Added paginators to many service clients, which make pagination of API results more convenient. | August 24, 2020 | | [Retries and timeouts](retries-timeouts.md) | Added information about retry modes. | August 20, 2020 | | [Using KMS keys for S3 encryption](kms-keys-s3-encryption.md) | Updated example to use version 2 of the S3 encryption client. | August 6, 2020 | | [Migrating from .NET Standard 1.3](migration-from-net-standard-1-3.md) | Added information about ending support for .NET Standard 1.3 at the end of 2020. | May 18, 2020 | | [Quick start](quick-start.md) | Added a quick-start section with basic setup and tutorials to introduce the reader to the AWS SDK for .NET. | March 27, 2020 | | [Enforcing TLS 1.2](enforcing-tls.md) | Added information about how to enforce TLS 1.2 in the SDK. | March 10, 2020 |