diff --git a/src/MCPDemo/MCPDemo.csproj b/src/MCPDemo/MCPDemo.csproj
index 364e2e9..d3df11f 100644
--- a/src/MCPDemo/MCPDemo.csproj
+++ b/src/MCPDemo/MCPDemo.csproj
@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="DotNetConfig.Configuration" Version="1.2.0" />
     <PackageReference Include="Microsoft.Extensions.Http" Version="9.0.7" />
-    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.2" />
+    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.4" />
     <PackageReference Include="SixLabors.ImageSharp" Version="3.1.10" />
   </ItemGroup>
 
diff --git a/src/Smith/Smith.csproj b/src/Smith/Smith.csproj
index 22ef719..5700baf 100644
--- a/src/Smith/Smith.csproj
+++ b/src/Smith/Smith.csproj
@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.2" />
+    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.4" />
     <PackageReference Include="NuGetizer" Version="1.2.4" PrivateAssets="all" />
     <PackageReference Include="DotNetEnv" Version="3.1.1" />
     <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.7" />