AWS SDK for .NET V3 end-of-support announcement

As previously announced, version 3 of the AWS SDK for .NET entered maintenance mode on March 1, 2026. In alignment with our SDKs and Tools Maintenance Policy, AWS SDK for .NET V3 has now reached end-of-support as of June 1, 2026. 

Starting June 1, 2026, there are no plans for further updates or releases for V3, including security fixes. Previously published releases should continue to be available via NuGet and the source code will remain on GitHub. 

What this means for you

If you are still using AWS SDK for .NET V3, your existing applications should continue to function. However, you should be aware of the following: 

• No new service support: V3 will not receive updates for new AWS services or new features for existing services. 

• No security patches: V3 will no longer receive security fixes. If a vulnerability is discovered, it will only be addressed in V4. 

• No bug fixes: No further bug fixes will be released for V3. 

Migrating to V4

We strongly encourage all customers still on V3 to migrate to AWS SDK for .NET V4 as soon as possible. V4 includes performance enhancements, bug fixes, and continued support for AWS services and regions. 

To help with your migration: 

• Review the Migration Guide to understand the breaking changes. 

• Update and test your applications with V4 in a development environment before updating production. 
• If you encounter issues during migration, open an issue on our GitHub repository. 

Conclusion

AWS SDK for .NET V3 has reached end-of-support. We strongly recommend migrating to V4 to continue receiving security updates, bug fixes, and support for AWS services. Migration documentation is available to guide you through the update process. 

For any questions or issues that arise while updating to the V4 SDK, please utilize the GitHub repository’s discussion forums or open GitHub issues to reach out to us. If you find dependencies that are preventing you from updating to V4, please let us know to see if we can help.