diff --git a/lang/csharp/src/IFC-dotnet.csproj b/lang/csharp/src/IFC-dotnet.csproj
index c4be6a00..c6094ac4 100644
--- a/lang/csharp/src/IFC-dotnet.csproj
+++ b/lang/csharp/src/IFC-dotnet.csproj
@@ -21,6 +21,6 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Antlr4.Runtime.Standard" Version="4.7.1" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/lang/csharp/test/IFC-dotnet-test.csproj b/lang/csharp/test/IFC-dotnet-test.csproj
index b7534237..ce5c1170 100644
--- a/lang/csharp/test/IFC-dotnet-test.csproj
+++ b/lang/csharp/test/IFC-dotnet-test.csproj
@@ -7,7 +7,7 @@
   <ItemGroup>
     <PackageReference Include="Antlr4.Runtime.Standard" Version="4.7.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0-preview-20170427-09" />
-    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.2" />
     <PackageReference Include="xunit" Version="2.3.0-beta2-build3683" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0-beta4-build3742" />