diff --git a/DicomTypeTranslation.Tests/DicomTypeTranslation.Tests.csproj b/DicomTypeTranslation.Tests/DicomTypeTranslation.Tests.csproj
index 2d599f3..1e75074 100644
--- a/DicomTypeTranslation.Tests/DicomTypeTranslation.Tests.csproj
+++ b/DicomTypeTranslation.Tests/DicomTypeTranslation.Tests.csproj
@@ -91,6 +91,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="NUnit" Version="4.1.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.3.0">
       <PrivateAssets>all</PrivateAssets>