.NET Alpine 3.21 images no longer maintained

[lbussell]

.NET container images based on Alpine 3.21 will no longer be maintained starting
today, 2025-12-09, per our policy. Alpine 3.22 images were released on 2025-06-10.

For more information, see our policies:

• Supported platforms policy
• Supported tags policy.

Details

Image tags containing alpine3.21 will no longer be updated. We will not delete existing 3.21 images or tags, but they now contain unsupported builds of Alpine and .NET.

If you are using one of the Alpine 3.21 tags such as 8.0-alpine3.21 or 9.0-alpine3.21, we recommended that you upgrade to Alpine 3.22 or Alpine 3.23. Alternatively, you can use a floating tag for Alpine such as 8.0-alpine or 9.0-alpine which updates automatically according to the supported tags policy.