diff --git a/src/Exercism.TestRunner.CSharp/Exercism.TestRunner.CSharp.csproj b/src/Exercism.TestRunner.CSharp/Exercism.TestRunner.CSharp.csproj
index 48d6cbd..e4bcd83 100644
--- a/src/Exercism.TestRunner.CSharp/Exercism.TestRunner.CSharp.csproj
+++ b/src/Exercism.TestRunner.CSharp/Exercism.TestRunner.CSharp.csproj
@@ -15,6 +15,7 @@
     <PackageReference Include="Exercism.Tests" Version="0.1.0-beta1" />
     <PackageReference Include="Humanizer.Core" Version="2.8.26" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.9.0" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.utility" Version="2.4.1" />
     <PackageReference Include="FakeItEasy" Version="6.2.1" />