diff --git a/src/BuiltInTools/BrowserRefresh/Microsoft.AspNetCore.Watch.BrowserRefresh.csproj b/src/BuiltInTools/BrowserRefresh/Microsoft.AspNetCore.Watch.BrowserRefresh.csproj
index 4aeac077f070..042b02c5f7c7 100644
--- a/src/BuiltInTools/BrowserRefresh/Microsoft.AspNetCore.Watch.BrowserRefresh.csproj
+++ b/src/BuiltInTools/BrowserRefresh/Microsoft.AspNetCore.Watch.BrowserRefresh.csproj
@@ -1,10 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\Watch\TargetFrameworks.props"/>
+
   <PropertyGroup>
     <!--
       This assembly may be loaded .NET 6.0+ web server.
-      When updating the TFM also update minimal supported version in dotnet-watch.csproj and WebApplicationAppModel.cs.
+      When adding new TFM also update versions in dotnet-watch.csproj and WebApplicationAppModel.cs.
     -->
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>$(MiddlewareTargetFrameworkV6)</TargetFramework>
     <DisableTransitiveFrameworkReferenceDownloads Condition="'$(DotNetBuildSourceOnly)' == 'true'">true</DisableTransitiveFrameworkReferenceDownloads>
 
     <StrongNameKeyId>MicrosoftAspNetCore</StrongNameKeyId>
diff --git a/src/BuiltInTools/DotNetDeltaApplier/Microsoft.Extensions.DotNetDeltaApplier.csproj b/src/BuiltInTools/DotNetDeltaApplier/Microsoft.Extensions.DotNetDeltaApplier.csproj
index 1d7658b6415e..8d20e8bef666 100644
--- a/src/BuiltInTools/DotNetDeltaApplier/Microsoft.Extensions.DotNetDeltaApplier.csproj
+++ b/src/BuiltInTools/DotNetDeltaApplier/Microsoft.Extensions.DotNetDeltaApplier.csproj
@@ -1,19 +1,20 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\Watch\TargetFrameworks.props"/>
+
   <PropertyGroup>
     <!--
       dotnet-watch may inject this assembly to .NET 6.0+ app.
-
-      When updating these also update ProjectReferences in dotnet-watch.csproj
+      When adding new TFM also update ProjectReferences in dotnet-watch.csproj
       and HotReloadAppModel.TryGetStartupHookPath.
     -->
-    <TargetFrameworks>net6.0;$(NetCurrent)</TargetFrameworks>
+    <TargetFrameworks>$(AgentTargetFrameworkV6);$(AgentTargetFrameworkV10)</TargetFrameworks>
     <StrongNameKeyId>MicrosoftAspNetCore</StrongNameKeyId>
 
     <DisableTransitiveFrameworkReferenceDownloads Condition="'$(DotNetBuildSourceOnly)' == 'true'">true</DisableTransitiveFrameworkReferenceDownloads>
   </PropertyGroup>
 
   <!-- Reference 6.0.0 targeting packs in Source Build -->
-  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(TargetFramework)' == 'net6.0'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(TargetFramework)' == '$(AgentTargetFrameworkV6)'">
     <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="6.0.0" />
   </ItemGroup>
 
diff --git a/src/BuiltInTools/HotReloadAgent.Host/Microsoft.DotNet.HotReload.Agent.Host.Package.csproj b/src/BuiltInTools/HotReloadAgent.Host/Microsoft.DotNet.HotReload.Agent.Host.Package.csproj
index 0944fd4171ba..33a8c8cf8d90 100644
--- a/src/BuiltInTools/HotReloadAgent.Host/Microsoft.DotNet.HotReload.Agent.Host.Package.csproj
+++ b/src/BuiltInTools/HotReloadAgent.Host/Microsoft.DotNet.HotReload.Agent.Host.Package.csproj
@@ -1,13 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\Watch\TargetFrameworks.props"/>
 
   <PropertyGroup>
     <!--
       This code may be injected into a .NET 6.0+ app.
 
-      When updating these also update ProjectReferences in dotnet-watch.csproj
+      When adding new TFM also update ProjectReferences in dotnet-watch.csproj
       and HotReloadAppModel.TryGetStartupHookPath.
     -->
-    <TargetFrameworks>net6.0;$(NetCurrent)</TargetFrameworks>
+    <TargetFrameworks>$(AgentTargetFrameworkV6);$(AgentTargetFrameworkV10)</TargetFrameworks>
     <DisableTransitiveFrameworkReferenceDownloads Condition="'$(DotNetBuildSourceOnly)' == 'true'">true</DisableTransitiveFrameworkReferenceDownloads>
 
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
@@ -27,7 +28,7 @@
   </PropertyGroup>
 
   <!-- Reference 6.0.0 targeting packs in Source Build -->
-  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(TargetFramework)' == 'net6.0'">
+  <ItemGroup Condition="'$(DotNetBuildSourceOnly)' == 'true' and '$(TargetFramework)' == '$(AgentTargetFrameworkV6)'">
     <FrameworkReference Update="Microsoft.NETCore.App" TargetingPackVersion="6.0.0" />
   </ItemGroup>
 
diff --git a/src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj b/src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj
index d44f61dd98ca..39c923c17161 100644
--- a/src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj
+++ b/src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj
@@ -1,10 +1,11 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\Watch\TargetFrameworks.props"/>
 
   <PropertyGroup>
     <!--
       Intentionally pinned. This feature is supported in projects targeting 6.0 or newer.
     -->
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>$(AgentTargetFrameworkV6)</TargetFramework>
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <DebugType>none</DebugType>
     <GenerateDependencyFile>false</GenerateDependencyFile>
diff --git a/src/BuiltInTools/Watch/AppModels/HotReloadAppModel.cs b/src/BuiltInTools/Watch/AppModels/HotReloadAppModel.cs
index 01d004c69268..7a205a8d1fce 100644
--- a/src/BuiltInTools/Watch/AppModels/HotReloadAppModel.cs
+++ b/src/BuiltInTools/Watch/AppModels/HotReloadAppModel.cs
@@ -16,7 +16,7 @@ protected static string GetInjectedAssemblyPath(string targetFramework, string a
 
     public static string GetStartupHookPath(ProjectGraphNode project)
     {
-        var hookTargetFramework = project.GetTargetFrameworkVersion() is { Major: >= 11 } ? "net11.0" : "net6.0";
+        var hookTargetFramework = project.GetTargetFrameworkVersion() is { Major: >= 10 } ? "net10.0" : "net6.0";
         return GetInjectedAssemblyPath(hookTargetFramework, "Microsoft.Extensions.DotNetDeltaApplier");
     }
 
diff --git a/src/BuiltInTools/Watch/RuntimeDependencies.props b/src/BuiltInTools/Watch/RuntimeDependencies.props
index 31f404503f25..45b8138bed6a 100644
--- a/src/BuiltInTools/Watch/RuntimeDependencies.props
+++ b/src/BuiltInTools/Watch/RuntimeDependencies.props
@@ -1,11 +1,13 @@
 <Project>
+  <Import Project="$(MSBuildThisFileDirectory)TargetFrameworks.props" />
+
   <ItemGroup>
     <ProjectReference Include="$(MSBuildThisFileDirectory)..\BrowserRefresh\Microsoft.AspNetCore.Watch.BrowserRefresh.csproj">
       <OutputItemType>None</OutputItemType>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
       <UndefineProperties>TargetFramework;TargetFrameworks</UndefineProperties>
-      <TargetPath>hotreload\net6.0\Microsoft.AspNetCore.Watch.BrowserRefresh.dll</TargetPath>
+      <TargetPath>hotreload\$(MiddlewareTargetFrameworkV6)\Microsoft.AspNetCore.Watch.BrowserRefresh.dll</TargetPath>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 
       <!--
@@ -19,8 +21,8 @@
       <OutputItemType>None</OutputItemType>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
-      <SetTargetFramework>TargetFramework=$(NetCurrent)</SetTargetFramework>
-      <TargetPath>hotreload\$(NetCurrent)\Microsoft.Extensions.DotNetDeltaApplier.dll</TargetPath>
+      <SetTargetFramework>TargetFramework=$(AgentTargetFrameworkV10)</SetTargetFramework>
+      <TargetPath>hotreload\$(AgentTargetFrameworkV10)\Microsoft.Extensions.DotNetDeltaApplier.dll</TargetPath>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Pack>false</Pack>
     </ProjectReference>
@@ -29,8 +31,8 @@
       <OutputItemType>None</OutputItemType>
       <SkipGetTargetFrameworkProperties>true</SkipGetTargetFrameworkProperties>
       <ReferenceOutputAssembly>false</ReferenceOutputAssembly>
-      <SetTargetFramework>TargetFramework=net6.0</SetTargetFramework>
-      <TargetPath>hotreload\net6.0\Microsoft.Extensions.DotNetDeltaApplier.dll</TargetPath>
+      <SetTargetFramework>TargetFramework=$(AgentTargetFrameworkV6)</SetTargetFramework>
+      <TargetPath>hotreload\$(AgentTargetFrameworkV6)\Microsoft.Extensions.DotNetDeltaApplier.dll</TargetPath>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
       <Pack>false</Pack>
     </ProjectReference>
diff --git a/src/BuiltInTools/Watch/TargetFrameworks.props b/src/BuiltInTools/Watch/TargetFrameworks.props
new file mode 100644
index 000000000000..33ddc22a275e
--- /dev/null
+++ b/src/BuiltInTools/Watch/TargetFrameworks.props
@@ -0,0 +1,15 @@
+<Project>
+  <!--
+    !!! Intentionally fixed versions. Do not update to the latest. !!!
+  -->
+  <PropertyGroup>
+    <!-- Used for assemblies injected to apps targeting .NET 6.0 - .NET 9.0. -->
+    <AgentTargetFrameworkV6>net6.0</AgentTargetFrameworkV6>
+
+    <!-- Used for assemblies injected to apps targeting .NET 10.0+ -->
+    <AgentTargetFrameworkV10>net10.0</AgentTargetFrameworkV10>
+
+    <!-- Used for assemblies injected to web apps targeting .NET 6.0+ -->
+    <MiddlewareTargetFrameworkV6>net6.0</MiddlewareTargetFrameworkV6>
+  </PropertyGroup>
+</Project>
diff --git a/src/BuiltInTools/Web.Middleware/Microsoft.DotNet.HotReload.Web.Middleware.Package.csproj b/src/BuiltInTools/Web.Middleware/Microsoft.DotNet.HotReload.Web.Middleware.Package.csproj
index 5bdde90926bf..f0c45e354c83 100644
--- a/src/BuiltInTools/Web.Middleware/Microsoft.DotNet.HotReload.Web.Middleware.Package.csproj
+++ b/src/BuiltInTools/Web.Middleware/Microsoft.DotNet.HotReload.Web.Middleware.Package.csproj
@@ -1,11 +1,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\Watch\TargetFrameworks.props"/>
 
   <PropertyGroup>
     <!--
       This source code may be loaded by a .NET 6.0+ web server.
       When updating the TFM also update minimal supported version in dotnet-watch.csproj and WebApplicationAppModel.cs.
     -->
-    <TargetFrameworks>net6.0</TargetFrameworks>
+    <TargetFrameworks>$(MiddlewareTargetFrameworkV6)</TargetFrameworks>
     <DisableTransitiveFrameworkReferenceDownloads Condition="'$(DotNetBuildSourceOnly)' == 'true'">true</DisableTransitiveFrameworkReferenceDownloads>
 
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
diff --git a/test/TestAssets/TestProjects/WatchApp60/Program.cs b/test/TestAssets/TestProjects/WatchApp60/Program.cs
deleted file mode 100644
index 5e164b48f9d7..000000000000
--- a/test/TestAssets/TestProjects/WatchApp60/Program.cs
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) .NET Foundation. All rights reserved.
-// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
-
-using System;
-using System.Diagnostics;
-using System.Threading;
-
-namespace ConsoleApplication
-{
-    public class Program
-    {
-        public static void Main(string[] args)
-        {
-            Console.WriteLine("Started");
-            // Process ID is insufficient because PID's may be reused.
-            Console.WriteLine($"Process identifier = {Process.GetCurrentProcess().Id}, {Guid.NewGuid()}");
-            if (args.Length > 0 && args[0] == "--no-exit")
-            {
-                Thread.Sleep(Timeout.Infinite);
-            }
-            Console.WriteLine("Exiting");
-        }
-    }
-}
diff --git a/test/TestAssets/TestProjects/WatchApp60/WatchApp60.csproj b/test/TestAssets/TestProjects/WatchApp60/WatchApp60.csproj
deleted file mode 100644
index f9ba9848ae6d..000000000000
--- a/test/TestAssets/TestProjects/WatchApp60/WatchApp60.csproj
+++ /dev/null
@@ -1,8 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
-    <OutputType>exe</OutputType>
-  </PropertyGroup>
-
-</Project>