diff --git a/ApiStackNet/packages.config b/ApiStackNet/packages.config
index 34b9fab..b94a0f7 100644
--- a/ApiStackNet/packages.config
+++ b/ApiStackNet/packages.config
@@ -5,7 +5,7 @@
   <package id="Autofac.WebApi2" version="4.2.0" targetFramework="net472" />
   <package id="AutoMapper" version="8.0.0" targetFramework="net472" />
   <package id="EntityFramework" version="6.2.0" targetFramework="net472" />
-  <package id="MessagePack" version="1.7.3.4" targetFramework="net472" />
+  <package id="MessagePack" version="1.9.3" targetFramework="net472" />
   <package id="Microsoft.AspNet.Mvc" version="5.1.0" targetFramework="net472" />
   <package id="Microsoft.AspNet.Razor" version="3.1.0" targetFramework="net472" />
   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.0" targetFramework="net472" />