diff --git a/MC6809/MC6809.UnitTest/MC6809.UnitTest.csproj b/MC6809/MC6809.UnitTest/MC6809.UnitTest.csproj
index 2565c3b..cbfb3d1 100644
--- a/MC6809/MC6809.UnitTest/MC6809.UnitTest.csproj
+++ b/MC6809/MC6809.UnitTest/MC6809.UnitTest.csproj
@@ -18,6 +18,10 @@
     <WarningLevel>9999</WarningLevel>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="MSTest" Version="3.8.3" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\EightBit\EightBit.csproj" />
     <ProjectReference Include="..\MC6809.csproj" />