diff --git a/dotnet-json.Tests/dotnet-json.Tests.csproj b/dotnet-json.Tests/dotnet-json.Tests.csproj
index e5eafec..3535571 100644
--- a/dotnet-json.Tests/dotnet-json.Tests.csproj
+++ b/dotnet-json.Tests/dotnet-json.Tests.csproj
@@ -13,6 +13,7 @@
   <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" PrivateAssets="All" />
     <PackageReference Include="coverlet.collector" Version="6.0.2" PrivateAssets="All" />