diff --git a/Directory.Packages.props b/Directory.Packages.props
index a5f5158..deb79a4 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -1,9 +1,9 @@
 <Project>
-
+  
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
-
+  
   <ItemGroup Label="Adapters">
     <!-- 12.x is the last Apache-2.0 line (13+ is commercially licensed). Pinning the floor here keeps
          Postie.AspNetCore.MediatR free by default; NuGet minimum-version semantics still let a consumer
@@ -12,7 +12,7 @@
     <PackageVersion Include="FluentValidation" Version="12.1.1" />
     <PackageVersion Include="FluentValidation.DependencyInjectionExtensions" Version="12.1.1" />
   </ItemGroup>
-
+  
   <ItemGroup>
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" Condition="'$(TargetFramework)' == 'net8.0'" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="9.0.9" Condition="'$(TargetFramework)' == 'net9.0'" />
@@ -21,17 +21,17 @@
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="9.0.9" Condition="'$(TargetFramework)' == 'net9.0'" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.9" Condition="'$(TargetFramework)' == 'net10.0'" />
   </ItemGroup>
-
+  
   <ItemGroup Label="Testing">
     <PackageVersion Include="coverlet.collector" Version="10.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
-    <PackageVersion Include="xunit.v3" Version="3.2.2" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageVersion Include="xunit.v3" Version="4.0.0" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="4.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.29" Condition="'$(TargetFramework)' == 'net8.0'" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.18" Condition="'$(TargetFramework)' == 'net9.0'" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="10.0.10" Condition="'$(TargetFramework)' == 'net10.0'" />
   </ItemGroup>
-
+  
   <ItemGroup Label="Samples">
     <PackageVersion Include="Microsoft.AspNetCore.OpenApi" Version="10.0.11" />
     <!-- Transitive of Microsoft.AspNetCore.OpenApi; pinned to pull the GHSA-v5pm-xwqc-g5wc fix. -->
@@ -40,5 +40,5 @@
     <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.18.0" />
     <PackageVersion Include="Scalar.AspNetCore" Version="2.17.2" />
   </ItemGroup>
-
+  
 </Project>
diff --git a/tests/Directory.Build.props b/tests/Directory.Build.props
index bb23367..ae31a70 100644
--- a/tests/Directory.Build.props
+++ b/tests/Directory.Build.props
@@ -7,7 +7,7 @@
     <IsTestProject>true</IsTestProject>
     <IsPackable>false</IsPackable>
     <Nullable>disable</Nullable>
-    <UseMicrosoftTestingPlatformRunner>false</UseMicrosoftTestingPlatformRunner>
+    <IsTestingPlatformApplication>false</IsTestingPlatformApplication>
   </PropertyGroup>
 
   <ItemGroup>