diff --git a/Chapter6_Unit_Testing/Exercise1/Guts.Tests/packages.config b/Chapter6_Unit_Testing/Exercise1/Guts.Tests/packages.config
index 82d1ba3..6d8292e 100644
--- a/Chapter6_Unit_Testing/Exercise1/Guts.Tests/packages.config
+++ b/Chapter6_Unit_Testing/Exercise1/Guts.Tests/packages.config
@@ -6,7 +6,7 @@
   <package id="Microsoft.CodeAnalysis.Analyzers" version="3.0.0" targetFramework="net472" developmentDependency="true" />
   <package id="Microsoft.CodeAnalysis.Common" version="3.7.0" targetFramework="net472" />
   <package id="Microsoft.CodeAnalysis.CSharp" version="3.7.0" 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" />
   <package id="System.Buffers" version="4.5.1" targetFramework="net472" />