diff --git a/CSharp/AuthorizationCodeFlow/packages.config b/CSharp/AuthorizationCodeFlow/packages.config
index c40adc5..0785fd1 100644
--- a/CSharp/AuthorizationCodeFlow/packages.config
+++ b/CSharp/AuthorizationCodeFlow/packages.config
@@ -26,7 +26,7 @@
   <package id="Microsoft.Owin.Security.Twitter" version="3.0.1" targetFramework="net452" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net452" />
   <package id="Modernizr" version="2.6.2" targetFramework="net452" />
-  <package id="Newtonsoft.Json" version="12.0.1" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net452" />
   <package id="Owin" version="1.0" targetFramework="net452" />
   <package id="Respond" version="1.2.0" targetFramework="net452" />
   <package id="Thinktecture.IdentityModel.Client" version="4.0.1" targetFramework="net452" />
diff --git a/CSharp/GrowthZone.Shared/GrowthZone.Shared.csproj b/CSharp/GrowthZone.Shared/GrowthZone.Shared.csproj
index 7977d1b..2230c68 100644
--- a/CSharp/GrowthZone.Shared/GrowthZone.Shared.csproj
+++ b/CSharp/GrowthZone.Shared/GrowthZone.Shared.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Newtonsoft.Json" Version="12.0.1" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>
 
 </Project>