diff --git a/src/Senparc.WebSocket/Senparc.WebSocket/packages.config b/src/Senparc.WebSocket/Senparc.WebSocket/packages.config
index 0ab72b8..cbcb410 100644
--- a/src/Senparc.WebSocket/Senparc.WebSocket/packages.config
+++ b/src/Senparc.WebSocket/Senparc.WebSocket/packages.config
@@ -3,6 +3,6 @@
   <package id="Antlr" version="3.4.1.9004" targetFramework="net45" />
   <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net45" />
   <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net45" />
-  <package id="Newtonsoft.Json" version="11.0.2" targetFramework="net45" />
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net45" />
   <package id="WebGrease" version="1.5.2" targetFramework="net45" />
 </packages>
\ No newline at end of file