aspire update fails to update AppHost SDK when using the new 13.x project format

[bodkul]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Running aspire update fails to update the AppHost SDK when the project uses the new simplified AppHost format introduced in Aspire 13.x:

<Project Sdk="Aspire.AppHost.Sdk/13.0.1">

The CLI expects the old-style format:

<Sdk Name="Aspire.AppHost.Sdk" Version="13.0.1" />

and therefore reports:

❌ Could not find <Sdk Name='Aspire.AppHost.Sdk' />

This makes the AppHost SDK impossible to update automatically.

Expected Behavior

aspire update should detect and update the SDK version inside:

<Project Sdk="Aspire.AppHost.Sdk/13.0.1">

and update it to:

<Project Sdk="Aspire.AppHost.Sdk/13.0.2">

The CLI should support the new project format documented for Aspire 13.x.

Steps To Reproduce

1. Create a new AppHost project using the Aspire 13.x template.
2. Ensure the project file uses the new simplified SDK format:
   <Project Sdk="Aspire.AppHost.Sdk/13.0.1">
3. Run the command:
   aspire update
4. The CLI detects available updates but fails with the error:
   ❌ Could not find <Sdk Name='Aspire.AppHost.Sdk' />

Exceptions (if any)

Executing: Update package Aspire.AppHost.Sdk from 13.0.1 to 13.0.2
❌ Could not find element in AppHost.csproj

.NET Version info

10.0

Anything else?

No response

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• The aspire update command did not automatically update .csproj file when upgrading from 9.x to 13.0.2. #13332

[davidfowl]

cc @mitchdenny

[davidfowl]

We should fix this for 13.1