diff --git a/src/ClientContacts/ClientContactsApi.cs b/src/ClientContacts/ClientContactsApi.cs
index 781862d..12f8bfd 100644
--- a/src/ClientContacts/ClientContactsApi.cs
+++ b/src/ClientContacts/ClientContactsApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Linq;
 using System.Threading.Tasks;
 using Novaloop.PaymoApi.ClientContacts.Models;
@@ -41,7 +42,7 @@ namespace Novaloop.PaymoApi.ClientContacts
         }
 
         /// <inheritdoc />
-        public async Task UpdateClientContact(ClientContact clientContact, int clientContactId)
+        public async Task UpdateClientContact(ExpandoObject clientContact, int clientContactId)
         {
             await _baseApi.Update(clientContact, clientContactId);
         }
diff --git a/src/ClientContacts/IClientContactsApi.cs b/src/ClientContacts/IClientContactsApi.cs
index e4c0660..f018dfc 100644
--- a/src/ClientContacts/IClientContactsApi.cs
+++ b/src/ClientContacts/IClientContactsApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Threading.Tasks;
 using Novaloop.PaymoApi.ClientContacts.Models;
 
@@ -36,6 +37,6 @@ namespace Novaloop.PaymoApi.ClientContacts
         /// <param name="clientContact"></param>
         /// <param name="clientContactId"></param>
         /// <returns></returns>
-        Task UpdateClientContact(ClientContact clientContact, int clientContactId);
+        Task UpdateClientContact(ExpandoObject clientContact, int clientContactId);
     }
 }
\ No newline at end of file
diff --git a/src/Clients/ClientsApi.cs b/src/Clients/ClientsApi.cs
index e688974..d7b40cb 100644
--- a/src/Clients/ClientsApi.cs
+++ b/src/Clients/ClientsApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Linq;
 using System.Threading.Tasks;
 using Novaloop.PaymoApi.Clients.Models;
@@ -41,7 +42,7 @@ namespace Novaloop.PaymoApi.Clients
         }
 
         /// <inheritdoc />
-        public async Task UpdateClient(Client client, int clientId)
+        public async Task UpdateClient(ExpandoObject client, int clientId)
         {
             await _baseApi.Update(client, clientId);
         }
diff --git a/src/Clients/IClientsApi.cs b/src/Clients/IClientsApi.cs
index b6d45c6..3b1b765 100644
--- a/src/Clients/IClientsApi.cs
+++ b/src/Clients/IClientsApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Threading.Tasks;
 using Novaloop.PaymoApi.Clients.Models;
 
@@ -36,6 +37,6 @@ namespace Novaloop.PaymoApi.Clients
         /// <param name="client"></param>
         /// <param name="clientId"></param>
         /// <returns></returns>
-        Task UpdateClient(Client client, int clientId);
+        Task UpdateClient(ExpandoObject client, int clientId);
     }
 }
\ No newline at end of file
diff --git a/src/Shared/BaseApi.cs b/src/Shared/BaseApi.cs
index 424b880..11d1106 100644
--- a/src/Shared/BaseApi.cs
+++ b/src/Shared/BaseApi.cs
@@ -1,6 +1,10 @@
+using System.Dynamic;
 using System.Net.Http;
+using System.Text;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Options;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
 using Novaloop.PaymoApi.Extensions;
 
 namespace Novaloop.PaymoApi.Shared
@@ -70,10 +74,13 @@ namespace Novaloop.PaymoApi.Shared
         /// <param name="entity">entity information to update the entity with</param>
         /// <param name="id">id of the entity to update</param>
         /// <returns></returns>
-        public async Task Update(TCreatType entity, int id)
+        public async Task Update(ExpandoObject entity, int id)
         {
             _client.SetApiKeyHeader(_options.ApiToken);
-            var response = await _client.PutAsJsonAsync($"api/{ResourceUri}/{id}", entity);
+            var serializerSettings = new JsonSerializerSettings {ContractResolver = new CamelCasePropertyNamesContractResolver()};
+            var body = JsonConvert.SerializeObject(entity, serializerSettings);
+            var stringContent = new StringContent(body, Encoding.UTF8, "application/json");
+            var response = await _client.PutAsync($"api/{ResourceUri}/{id}", stringContent);
             await response.ThrowExceptionWithDetailsIfUnsuccessful();
         }
     }
diff --git a/src/Shared/IBaseApi.cs b/src/Shared/IBaseApi.cs
index fbf7b58..842e55a 100644
--- a/src/Shared/IBaseApi.cs
+++ b/src/Shared/IBaseApi.cs
@@ -1,3 +1,4 @@
+using System.Dynamic;
 using System.Threading.Tasks;
 
 namespace Novaloop.PaymoApi.Shared
@@ -36,6 +37,6 @@ namespace Novaloop.PaymoApi.Shared
         /// <param name="entity">entity information to update the entity with</param>
         /// <param name="id">id of the entity to update</param>
         /// <returns></returns>
-        Task Update( TCreatType entity, int id);
+        Task Update(ExpandoObject entity, int id);
     }
 }
\ No newline at end of file
diff --git a/src/Tasks/ITasksApi.cs b/src/Tasks/ITasksApi.cs
index 7aed1d6..d657678 100644
--- a/src/Tasks/ITasksApi.cs
+++ b/src/Tasks/ITasksApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Threading.Tasks;
 
 namespace Novaloop.PaymoApi.Tasks
@@ -35,6 +36,6 @@ namespace Novaloop.PaymoApi.Tasks
         /// <param name="task"></param>
         /// <param name="taskId"></param>
         /// <returns></returns>
-        Task UpdateTask(Novaloop.PaymoApi.Tasks.Models.Task task, int taskId);
+        Task UpdateTask(ExpandoObject task, int taskId);
     }
 }
\ No newline at end of file
diff --git a/src/Tasks/TasksApi.cs b/src/Tasks/TasksApi.cs
index 103506c..fde8897 100644
--- a/src/Tasks/TasksApi.cs
+++ b/src/Tasks/TasksApi.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Dynamic;
 using System.Linq;
 using System.Threading.Tasks;
 using Novaloop.PaymoApi.Shared;
@@ -45,7 +46,7 @@ namespace Novaloop.PaymoApi.Tasks
 
 
         /// <inheritdoc />
-        public async Task UpdateTask(Novaloop.PaymoApi.Tasks.Models.Task task, int taskId)
+        public async Task UpdateTask(ExpandoObject task, int taskId)
         {
             await _baseApi.Update(task, taskId);
         }
diff --git a/tests/ClientsApiTests.cs b/tests/ClientsApiTests.cs
index d60e24a..319d113 100644
--- a/tests/ClientsApiTests.cs
+++ b/tests/ClientsApiTests.cs
@@ -1,3 +1,4 @@
+using System.Dynamic;
 using System.Linq;
 using Novaloop.PaymoApi.Clients;
 using Novaloop.PaymoApi.Clients.Models;
@@ -84,7 +85,8 @@ namespace Novaloop.PaymoApi.Tests
         {
             // Arrange
             var createdClient = await _clientsApi.CreateClient(_testClient);
-            var clientUpdateInfo = new Client {Name = "Updated"};
+            dynamic clientUpdateInfo = new ExpandoObject();
+            clientUpdateInfo.Name = "Updated";
 
             // Act
             await _clientsApi.UpdateClient(clientUpdateInfo, createdClient.Id);
diff --git a/tests/TasksApiTests.cs b/tests/TasksApiTests.cs
index 566a929..9cf2728 100644
--- a/tests/TasksApiTests.cs
+++ b/tests/TasksApiTests.cs
@@ -1,3 +1,4 @@
+using System.Dynamic;
 using System.Linq;
 using Novaloop.PaymoApi.Shared;
 using Novaloop.PaymoApi.Tasks;
@@ -95,7 +96,9 @@ namespace Novaloop.PaymoApi.Tests
             var existingTaskListId = (await _tasksApi.GetTasks()).First().TasklistId;
             _testTask.TasklistId = existingTaskListId;
             var createdTask = await _tasksApi.CreateTask(_testTask);
-            var taskUpdateInfo = new Task {Name = "Updated", TasklistId = _testTask.TasklistId};
+            dynamic taskUpdateInfo = new ExpandoObject();
+            taskUpdateInfo.Name = "Updated";
+            taskUpdateInfo.TaskListId = _testTask.TasklistId;
 
             // Act
             await _tasksApi.UpdateTask(taskUpdateInfo, createdTask.Id);