diff --git a/source/HolisticWare.Core.Math.Polynomials.NetStandard13/HolisticWare.Core.Math.Polynomials.NetStandard13.csproj b/source/HolisticWare.Core.Math.Polynomials.NetStandard13/HolisticWare.Core.Math.Polynomials.NetStandard13.csproj
index 7a7f792..915ab14 100644
--- a/source/HolisticWare.Core.Math.Polynomials.NetStandard13/HolisticWare.Core.Math.Polynomials.NetStandard13.csproj
+++ b/source/HolisticWare.Core.Math.Polynomials.NetStandard13/HolisticWare.Core.Math.Polynomials.NetStandard13.csproj
@@ -9,7 +9,7 @@
     <PackageReference Include="System.Runtime" Version="4.3.1" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
     <PackageReference Include="System.IO" Version="4.3.0" />
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="System.Xml.XmlSerializer" Version="4.3.0" />
   </ItemGroup>
   <Import Project="..\HolisticWare.Core.Math.Polynomials\HolisticWare.Core.Math.Polynomials.projitems" Label="Shared" Condition="Exists('..\HolisticWare.Core.Math.Polynomials\HolisticWare.Core.Math.Polynomials.projitems')" />