diff --git a/BotSharp.Platform.Models/BotSharp.Platform.Models.csproj b/BotSharp.Platform.Models/BotSharp.Platform.Models.csproj
index c940c0e2..00dc04f2 100644
--- a/BotSharp.Platform.Models/BotSharp.Platform.Models.csproj
+++ b/BotSharp.Platform.Models/BotSharp.Platform.Models.csproj
@@ -7,6 +7,10 @@
     <PackageProjectUrl>https://github.com/Oceania2018/BotSharp</PackageProjectUrl>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.ComponentModel.Annotations" Version="4.5.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <Reference Include="System.ComponentModel.Annotations">
       <HintPath>C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.1.0\ref\netcoreapp2.1\System.ComponentModel.Annotations.dll</HintPath>