diff --git a/c-sharp/file-upload/api/packages.config b/c-sharp/file-upload/api/packages.config
index 455c7c4..ed77f70 100644
--- a/c-sharp/file-upload/api/packages.config
+++ b/c-sharp/file-upload/api/packages.config
@@ -19,7 +19,7 @@
   <package id="Microsoft.Owin.Host.SystemWeb" version="4.1.0" targetFramework="net48" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net48" />
   <package id="Modernizr" version="2.8.3" targetFramework="net48" />
-  <package id="Newtonsoft.Json" version="11.0.1" targetFramework="net48" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net48" />
   <package id="Owin" version="1.0" targetFramework="net48" />
   <package id="WebGrease" version="1.6.0" targetFramework="net48" />
 </packages>
\ No newline at end of file