diff --git a/aspire.AppHost/aspire.AppHost.csproj b/aspire.AppHost/aspire.AppHost.csproj
index fc0c959..d277f63 100644
--- a/aspire.AppHost/aspire.AppHost.csproj
+++ b/aspire.AppHost/aspire.AppHost.csproj
@@ -13,6 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Aspire.Hosting.AppHost" Version="13.3.3" />
+    <PackageReference Include="MessagePack" Version="2.5.301" />
   </ItemGroup>
 
   <ItemGroup>