diff --git a/ChronoJsonDiffPatch/ChronoJsonDiffPatchTests/ChronoJsonDiffPatchTests.csproj b/ChronoJsonDiffPatch/ChronoJsonDiffPatchTests/ChronoJsonDiffPatchTests.csproj
index e95ee63..3740e9b 100644
--- a/ChronoJsonDiffPatch/ChronoJsonDiffPatchTests/ChronoJsonDiffPatchTests.csproj
+++ b/ChronoJsonDiffPatch/ChronoJsonDiffPatchTests/ChronoJsonDiffPatchTests.csproj
@@ -11,6 +11,7 @@
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
         <PackageReference Include="xunit" Version="2.9.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>