diff --git a/server/Anvil.Server.csproj b/server/Anvil.Server.csproj
index 45359f6..91cfe21 100644
--- a/server/Anvil.Server.csproj
+++ b/server/Anvil.Server.csproj
@@ -22,8 +22,8 @@
     <!-- Model Context Protocol server (official C# SDK) — in-process HTTP MCP
          at /mcp. The server still references NEITHER PicoGK NOR the worker: MCP
          tools shell out to AnvilWorker.exe exactly like the HTTP API does. -->
-    <PackageReference Include="ModelContextProtocol" Version="1.4.1" />
-    <PackageReference Include="ModelContextProtocol.AspNetCore" Version="1.4.1" />
+    <PackageReference Include="ModelContextProtocol" Version="2.1.0" />
+    <PackageReference Include="ModelContextProtocol.AspNetCore" Version="2.1.0" />
   </ItemGroup>
 
 </Project>