
AWS is announcing the end-of-support for AWS SDK for .NET v3.x on March 1, 2026, and strongly recommends upgrading to version 4.x for enhanced performance, bug fixes, and modernization.


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<p>
AWS has announced the end-of-support for the AWS SDK for .NET v3, with a planned timeline for transition to version 4.x.
</p>
<ul>
<li>End-of-support begins March 1, 2026</li>
<li>Version 4.x became generally available on April 28, 2025</li>
<li>From March 1, 2026, only critical bug fixes and security updates will be provided</li>
<li>Full end-of-support occurs on June 1, 2026</li>
<li>Existing applications will continue to function unless fundamental AWS service changes occur</li>
</ul>
<p>
AWS strongly recommends upgrading to version 4.x, which offers performance enhancements, bug fixes, and modernization for .NET. Migration resources and documentation are available to assist developers in transitioning.
</p>
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Announcing the end-of-support for the AWS SDK for .NET v3

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