diff --git a/src/Tests/Finos.Fdc3.NewtonsoftJson.Tests/Finos.Fdc3.NewtonsoftJson.Tests.csproj b/src/Tests/Finos.Fdc3.NewtonsoftJson.Tests/Finos.Fdc3.NewtonsoftJson.Tests.csproj
index 869a0b3..a92851c 100644
--- a/src/Tests/Finos.Fdc3.NewtonsoftJson.Tests/Finos.Fdc3.NewtonsoftJson.Tests.csproj
+++ b/src/Tests/Finos.Fdc3.NewtonsoftJson.Tests/Finos.Fdc3.NewtonsoftJson.Tests.csproj
@@ -21,7 +21,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
         <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-        <PackageReference Include="Newtonsoft.Json.Schema" Version="3.0.14" />
+        <PackageReference Include="Newtonsoft.Json.Schema" Version="4.0.1" />
         <PackageReference Include="xunit" Version="2.9.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>