diff --git a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
index b1bdc516e61..1de44dc0d0d 100644
--- a/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
+++ b/build-tools/xaprepare/xaprepare/Steps/Step_InstallDotNetPreview.cs
@@ -54,7 +54,8 @@ protected override async Task<bool> Execute (Context context)
 			var sdk_manifests = Path.Combine (dotnetPath, "sdk-manifests");
 
 			// Copy the WorkloadManifest.* files from the latest Microsoft.NET.Workload.* listed in package-download.proj
-			var dotnets = new [] { "net6", "net7", "net8", "net9", "current" };
+			// TODO: net9 missing from dotnet10 feed
+			var dotnets = new [] { "net6", "net7", "net8", "current" };
 			foreach (var dotnet in dotnets) {
 				var destination = Path.Combine (sdk_manifests,
 					context.Properties.GetRequiredValue (KnownProperties.DotNetMonoManifestVersionBand),
diff --git a/build-tools/xaprepare/xaprepare/package-download.proj b/build-tools/xaprepare/xaprepare/package-download.proj
index f68692ad0b9..c68556ac610 100644
--- a/build-tools/xaprepare/xaprepare/package-download.proj
+++ b/build-tools/xaprepare/xaprepare/package-download.proj
@@ -24,12 +24,14 @@ Otherwise, $(MicrosoftNETCoreAppRefPackageVersion) from eng/Versions.props will
     <PackageDownload Include="Microsoft.NET.Workload.Mono.ToolChain.net6.Manifest-$(DotNetMonoManifestVersionBand)" Version="[$(DotNetRuntimePacksVersion)]" />
     <PackageDownload Include="Microsoft.NET.Workload.Mono.ToolChain.net7.Manifest-$(DotNetMonoManifestVersionBand)" Version="[$(DotNetRuntimePacksVersion)]" />
     <PackageDownload Include="Microsoft.NET.Workload.Mono.ToolChain.net8.Manifest-$(DotNetMonoManifestVersionBand)" Version="[$(DotNetRuntimePacksVersion)]" />
-    <PackageDownload Include="Microsoft.NET.Workload.Mono.ToolChain.net9.Manifest-$(DotNetMonoManifestVersionBand)" Version="[$(DotNetRuntimePacksVersion)]" />
+    <!-- TODO: missing from dotnet10 feed -->
+    <!-- <PackageDownload Include="Microsoft.NET.Workload.Mono.ToolChain.net9.Manifest-$(DotNetMonoManifestVersionBand)" Version="[$(DotNetRuntimePacksVersion)]" /> -->
     <PackageDownload Include="Microsoft.NET.Workload.Emscripten.Current.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" />
     <PackageDownload Include="Microsoft.NET.Workload.Emscripten.net6.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" />
     <PackageDownload Include="Microsoft.NET.Workload.Emscripten.net7.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" />
     <PackageDownload Include="Microsoft.NET.Workload.Emscripten.net8.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" />
-    <PackageDownload Include="Microsoft.NET.Workload.Emscripten.net9.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" />
+    <!-- TODO: missing from dotnet10 feed -->
+    <!-- <PackageDownload Include="Microsoft.NET.Workload.Emscripten.net9.Manifest-$(DotNetEmscriptenManifestVersionBand)" Version="[$(MicrosoftNETWorkloadEmscriptenPackageVersion)]" /> -->
   </ItemGroup>
 
 </Project>