diff --git a/src/CalendarSyncPlus/CalendarSyncPlus.Test/packages.config b/src/CalendarSyncPlus/CalendarSyncPlus.Test/packages.config
index ca7f896..c205aaa 100644
--- a/src/CalendarSyncPlus/CalendarSyncPlus.Test/packages.config
+++ b/src/CalendarSyncPlus/CalendarSyncPlus.Test/packages.config
@@ -10,7 +10,7 @@
   <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net45" />
   <package id="Microsoft.Exchange.WebServices" version="2.2" targetFramework="net45" />
   <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net45" />
   <package id="waf" version="3.0.0" targetFramework="net45" />
   <package id="Zlib.Portable" version="1.10.0" targetFramework="net45" />
 </packages>
\ No newline at end of file