diff --git a/RhSolutions.AddIn/RhSolutions.AddIn.csproj b/RhSolutions.AddIn/RhSolutions.AddIn.csproj
index 87d8d5c..d2d70e8 100644
--- a/RhSolutions.AddIn/RhSolutions.AddIn.csproj
+++ b/RhSolutions.AddIn/RhSolutions.AddIn.csproj
@@ -30,9 +30,13 @@
 		</PackageReference>
 		<PackageReference Include="ExcelDna.Integration" Version="1.6.0" />
 		<PackageReference Include="ExcelDna.Interop" Version="15.0.1" />
+		<PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
+		<PackageReference Include="Microsoft.Bcl.HashCode" Version="1.1.1" />
 		<PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
 		<PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0" />
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
 		<PackageReference Include="RhSolutions.Sku" Version="0.1.1" />
+		<PackageReference Include="System.Buffers" Version="4.5.1" />
+		<PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
 	</ItemGroup>
 </Project>
\ No newline at end of file