diff --git a/Directory.Packages.props b/Directory.Packages.props
index 0693854..49a1408 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -8,7 +8,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageVersion>
-    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.2" />
+    <PackageVersion Include="ModelContextProtocol" Version="0.3.0-preview.4" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="10.0.0-rc.2.25502.107" />
     <!-- Roslyn Scripting -->
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Scripting" Version="4.14.0" />