Google Protobuf re-casting

Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using ProtoBuf;

namespace TestConsoleApp
{
    [ProtoContract]
    public class TestClass
    {
        [ProtoMember(1)]
        public string Value { get; set; }
    }

    public class Program
    {
        static void Main(string[] args)
        {
            var testClass = new TestClass { Value = "test" };
            var handlerList = new Dictionary<Type, dynamic>();

            handlerList.Add(typeof(TestClass), new Action<TestClass>(TCHandler));

            byte[] serializedBytes;
            using (var ms = new MemoryStream())
            {
                Serializer.Serialize(ms, testClass);
                serializedBytes = ms.ToArray();
            }

            dynamic deserializedClass;
            using (var ms = new MemoryStream(serializedBytes))
            {
                deserializedClass = Serializer.Deserialize(typeof(TestClass), ms);
            }

            deserializedClass = Convert.ChangeType(deserializedClass, typeof(TestClass));

            handlerList[typeof(TestClass)].Invoke(deserializedClass);

            Console.ReadKey();
        }

        private static void TCHandler(TestClass testClass)
        {
            Console.WriteLine(testClass.Value);
        }
    }
}