diff --git a/cs-trinity-test/packages.config b/cs-trinity-test/packages.config
index 2bd23bd..1ba0879 100644
--- a/cs-trinity-test/packages.config
+++ b/cs-trinity-test/packages.config
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Akka" version="1.3.8" targetFramework="net47" />
-  <package id="MessagePack" version="1.7.3.4" targetFramework="net47" />
+  <package id="MessagePack" version="1.9.3" targetFramework="net47" />
   <package id="Microsoft.AspNetCore.Connections.Abstractions" version="2.1.1" targetFramework="net47" />
   <package id="Microsoft.AspNetCore.Hosting" version="2.1.1" targetFramework="net47" />
   <package id="Microsoft.AspNetCore.Hosting.Abstractions" version="2.1.1" targetFramework="net47" />