diff --git a/Chapter6_Unit_Testing/Exercise1/NumberConverter.UI.Tests/packages.config b/Chapter6_Unit_Testing/Exercise1/NumberConverter.UI.Tests/packages.config
index 2cce931..fedc1d8 100644
--- a/Chapter6_Unit_Testing/Exercise1/NumberConverter.UI.Tests/packages.config
+++ b/Chapter6_Unit_Testing/Exercise1/NumberConverter.UI.Tests/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.7" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="12.0.3" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="NUnit" version="3.12.0" targetFramework="net472" />
   <package id="NUnit3TestAdapter" version="3.17.0" targetFramework="net472" />
 </packages>
\ No newline at end of file