.NET 9 - Xcode 16.4 support (9219)

Note

Xcode 16.4 is required with this release. Xcode 16.4 requires macOS 15.3+.

This is a servicing release to the previous .NET 9 release.

Note: these are the base SDKs that add support for the platforms in question, for MAUI (which is built on top of our SDKs), go here instead: https://docs.microsoft.com/en-us/dotnet/maui/.

Versions

This release consists of the following versions:

• iOS: 18.5.9219
• tvOS: 18.5.9219
• macOS: 15.5.9219
• Mac Catalyst: 18.5.9219

Installation

You can use workload set version 9.0.305 in order to install these versions of the SDKs.

Please make sure to be using the latest 9.0.305 before issuing the dotnet workload install command below. You can
validate your installed dotnet version using dotnet --version do make sure it shows 9.0.305 or greater before proceeding.

dotnet workload install <workload id(s)> --version 9.0.305

Available workload ids

• ios
• tvos
• macos
• maccatalyst
• android (see https://github.com/dotnet/android)
• maui (see https://github.com/dotnet/maui)

Example command installing all listed workloads.

dotnet workload install ios tvos macos maccatalyst maui android --version 9.0.305

You can use dotnet workload --info to validate the workload versions installed in your system.

What's Changed

• [msbuild] Compute DOTNET_DiagnosticPorts using MSBuild properties. by @rolfbjarne in #23629
• Bump mlaunch to get a version that works with Xcode 26. by @rolfbjarne in #23590

Full Changelog: dotnet-9.0.1xx-xcode16.5-9215...dotnet-9.0.1xx-xcode16.5-9219