diff --git a/Chapter13/Exercise09.Tests/Exercise09.Tests.csproj b/Chapter13/Exercise09.Tests/Exercise09.Tests.csproj
index 273eb11..76c4d65 100644
--- a/Chapter13/Exercise09.Tests/Exercise09.Tests.csproj
+++ b/Chapter13/Exercise09.Tests/Exercise09.Tests.csproj
@@ -14,7 +14,7 @@
 		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.1.0" />
 		<PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-		<PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+		<PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
 		<PackageReference Include="NUnit" Version="3.13.2" />
 		<PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
 		<PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />