diff --git a/04-PracticalSamples/src/src/McpSample.ServiceDefaults/McpSample.ServiceDefaults.csproj b/04-PracticalSamples/src/src/McpSample.ServiceDefaults/McpSample.ServiceDefaults.csproj
index da45504..746bfd8 100644
--- a/04-PracticalSamples/src/src/McpSample.ServiceDefaults/McpSample.ServiceDefaults.csproj
+++ b/04-PracticalSamples/src/src/McpSample.ServiceDefaults/McpSample.ServiceDefaults.csproj
@@ -14,6 +14,6 @@
 	  <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.12.0" />
 	  <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.12.0" />
 	  <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.12.0" />
-    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.3" />
+    <PackageReference Include="ModelContextProtocol" Version="0.3.0-preview.4" />
   </ItemGroup>
 </Project>
\ No newline at end of file