diff --git a/DotNetifyLib.SignalR.Owin/DotNetifyHub.cs b/DotNetifyLib.SignalR.Owin/DotNetifyHub.cs
index d16d2545..5732f5dd 100644
--- a/DotNetifyLib.SignalR.Owin/DotNetifyHub.cs
+++ b/DotNetifyLib.SignalR.Owin/DotNetifyHub.cs
@@ -23,6 +23,7 @@ limitations under the License.
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using DotNetify.Security;
+using System.Linq;
 
 namespace DotNetify
 {
@@ -118,16 +119,7 @@ public override Task OnDisconnected(bool stopCalled)
       /// <param name="vmArg">Optional argument that may contain view model's initialization argument and/or request headers.</param>
       public void Request_VM(string vmId, object vmArg)
       {
-         JObject data = null;
-         if (vmArg != null)
-         {
-            if (vmArg is JObject)
-               // Newtonsoft.Json protocol.
-               data = vmArg as JObject;
-            else
-               // MessagePack protocol.
-               data = JObject.FromObject(vmArg);
-         }
+         object data = NormalizeType(vmArg);
 
          try
          {
@@ -159,9 +151,11 @@ public void Request_VM(string vmId, object vmArg)
       /// <param name="vmData">View model update data, where key is the property path and value is the property's new value.</param>
       public void Update_VM(string vmId, Dictionary<string, object> vmData)
       {
+         var data = vmData?.ToDictionary(x => x.Key, x => NormalizeType(x.Value));
+
          try
          {
-            _hubContext = new DotNetifyHubContext(Context, nameof(Request_VM), vmId, vmData, null, Principal);
+            _hubContext = new DotNetifyHubContext(Context, nameof(Request_VM), vmId, data, null, Principal);
             _hubPipeline.RunMiddlewares(_hubContext, ctx =>
             {
                Principal = ctx.Principal;
@@ -265,6 +259,24 @@ internal void HandleMulticastMessage(string messageType, string vmId, string ser
 
       #endregion Server Responses
 
+      /// <summary>
+      /// Normalizes the type of the object argument to JObject when possible.
+      /// </summary>
+      /// <param name="data">Arbitrary object.</param>
+      /// <returns>JObject if the object is convertible; otherwise unchanged.</returns>
+      private object NormalizeType(object data)
+      {
+         if (data == null)
+            return null;
+         else if (data is JObject)
+            // Newtonsoft.Json protocol.
+            return data as JObject;
+         else if (!(data.GetType().IsPrimitive || data is string))
+            // MessagePack protocol.
+            return JObject.FromObject(data);
+         return data;
+      }
+
       /// <summary>
       /// Runs the view model filter.
       /// </summary>