AWS DevOps & Developer Productivity Blog
Announcing the end-of-support for the AWS SDK for .NET v3
We are announcing the end-of-support for the AWS SDK for .NET v3.x starting on March 1, 2026, in accordance with the SDK and Tools maintenance policy. On April 28, 2025, the next major version of the AWS SDK for .NET, version 4.x, became generally available (blog post). Version 4.x of the SDK includes bug fixes, performance enhancements, and modernization for .NET. We strongly encourage you to upgrade to take advantage of these enhancements.
Existing applications that use the AWS SDK for .NET v3.x will continue to function as intended unless there is a fundamental change to how an AWS service works. This is uncommon, and we will announce it broadly if it happens. Beginning March 1, 2026, the AWS SDK for .NET v3.x will only receive critical bug fixes and security updates, and we will not update it to support new AWS services, new service features, or changes to existing services. After June 1, 2026, when the AWS SDK for .NET v3.x reaches end-of-support, it will no longer receive updates or releases.
End of Support Timeline for Version 3
The timeline for end-of-support is as follows, as defined by the SDK major version lifecycle:
| Phase | Start Date | End Date | Support Level |
| General Availability | July 28, 2015 | June 1, 2026 | During this phase, the SDK is fully supported. AWS will provide regular SDK releases that include support for new services, API updates for existing services, as well as bug and security fixes. |
| Maintenance Mode | March 1, 2026 | June 1, 2026 | During the maintenance mode, AWS limits SDK releases to address critical bug fixes and security issues only. An SDK will not receive API updates for new or existing services, or be updated to support new regions |
| End-of-Support | June 1, 2026 | N/A | When an SDK reaches end-of support, it will no longer receive updates or releases. Previously published releases will continue to be available via public package managers and the code will remain on GitHub. The GitHub repository may be archived. |
References for AWS SDK for .NET Version 4
Use the following references to learn more about the AWS SDK for .NET v4.x along with migration support.
- Migrating to version 4 of the AWS SDK for .NET– A guide to migrating your AWS SDK for .NET v3.x applications to the AWS SDK for .NET v4.x.
- Development Tracker-A tracker for v4.x development that contains additional details about some changes in the SDK. This can be useful to understand more about the changes that were implemented.
- .NET v4.x Code Examples– Code examples to help you use v4.x.
Conclusion
We recommend you upgrade to the latest major version of the AWS SDK for .NET v4.x by using the migration guide. This major version includes, but is not limited to, performance enhancements, bug fixes, modern .NET libraries and frameworks, and the latest AWS service updates. To learn more, please refer to the AWS SDK for .NET GA blog post.
If you need assistance or have feedback, reach out to your usual AWS support contacts. You can also open a discussion or issue on GitHub. Thank you for using the AWS SDK for .NET.