diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index fa9943e..bbcfb4a 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -3,8 +3,16 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
 
-  <!-- The test host follows the runtime the tests run on. -->
+  <!--
+    The packages depend on the Microsoft.Extensions.* line of the runtime they target, so an app on
+    net8.0 is not pulled up to the 10.x packages. Embedded stays on 10.x: the .NET 10 SDK prunes the
+    older versions, which drops the task that writes the embedded files manifest.
+    The test host follows the runtime the tests run on.
+  -->
   <PropertyGroup>
+    <MicrosoftExtensionsVersion>10.0.12</MicrosoftExtensionsVersion>
+    <MicrosoftExtensionsVersion Condition="'$(TargetFramework)' == 'net8.0'">8.0.0</MicrosoftExtensionsVersion>
+    <MicrosoftExtensionsVersion Condition="'$(TargetFramework)' == 'net9.0'">9.0.0</MicrosoftExtensionsVersion>
     <AspNetCoreTestVersion>10.0.12</AspNetCoreTestVersion>
     <AspNetCoreTestVersion Condition="'$(TargetFramework)' == 'net8.0'">8.0.31</AspNetCoreTestVersion>
     <AspNetCoreTestVersion Condition="'$(TargetFramework)' == 'net9.0'">9.0.20</AspNetCoreTestVersion>
@@ -12,11 +20,11 @@
 
   <ItemGroup>
     <!-- Microsoft.Extensions.* -->
-    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="10.0.12" />
-    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="$(MicrosoftExtensionsVersion)" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="$(MicrosoftExtensionsVersion)" />
     <PackageVersion Include="Microsoft.Extensions.FileProviders.Embedded" Version="10.0.12" />
-    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="10.0.12" />
-    <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="10.0.12" />
+    <PackageVersion Include="Microsoft.Extensions.Hosting.Abstractions" Version="$(MicrosoftExtensionsVersion)" />
+    <PackageVersion Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="$(MicrosoftExtensionsVersion)" />
 
     <!-- ASP.NET Core test hosting -->
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="$(AspNetCoreTestVersion)" />