diff --git a/PlayTennis.Tests/packages.config b/PlayTennis.Tests/packages.config
index f626385..8082d8b 100644
--- a/PlayTennis.Tests/packages.config
+++ b/PlayTennis.Tests/packages.config
@@ -15,5 +15,5 @@
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net472" />
   <package id="MSTest.TestAdapter" version="1.2.0" targetFramework="net472" />
   <package id="MSTest.TestFramework" version="1.2.0" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
 </packages>
\ No newline at end of file
diff --git a/PlayTennis/packages.config b/PlayTennis/packages.config
index 8ca7f03..cde9963 100644
--- a/PlayTennis/packages.config
+++ b/PlayTennis/packages.config
@@ -49,7 +49,7 @@
   <package id="Microsoft.Owin.Security.Twitter.it" version="4.0.0" targetFramework="net472" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net472" />
   <package id="Modernizr" version="2.8.3" targetFramework="net472" />
-  <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
   <package id="Owin" version="1.0" targetFramework="net472" />
   <package id="Sammy.js" version="0.7.5" targetFramework="net472" />
   <package id="WebGrease" version="1.6.0" targetFramework="net472" />