diff --git a/src/Mailgun/Model/Attachment/Attachment.php b/src/Mailgun/Model/Attachment/Attachment.php
index f9ebe7e..80e3976 100644
--- a/src/Mailgun/Model/Attachment/Attachment.php
+++ b/src/Mailgun/Model/Attachment/Attachment.php
@@ -14,7 +14,7 @@ use Mailgun\Model\ApiResponse;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class Attachment implements ApiResponse
+final class Attachment implements ApiResponse
 {
     private $data;
 
diff --git a/src/Mailgun/Model/Event/Event.php b/src/Mailgun/Model/Event/Event.php
index 5165bd2..63f6c68 100644
--- a/src/Mailgun/Model/Event/Event.php
+++ b/src/Mailgun/Model/Event/Event.php
@@ -12,7 +12,7 @@ namespace Mailgun\Model\Event;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class Event
+final class Event
 {
     /**
      * @var string status
diff --git a/src/Mailgun/Model/Event/EventResponse.php b/src/Mailgun/Model/Event/EventResponse.php
index 303492a..6daa3e0 100644
--- a/src/Mailgun/Model/Event/EventResponse.php
+++ b/src/Mailgun/Model/Event/EventResponse.php
@@ -16,7 +16,7 @@ use Mailgun\Model\ApiResponse;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class EventResponse implements ApiResponse, PagingProvider
+final class EventResponse implements ApiResponse, PagingProvider
 {
     use PaginationResponse;
 
diff --git a/src/Mailgun/Model/Message/SendResponse.php b/src/Mailgun/Model/Message/SendResponse.php
index 8bd8e8c..df57ffe 100644
--- a/src/Mailgun/Model/Message/SendResponse.php
+++ b/src/Mailgun/Model/Message/SendResponse.php
@@ -14,7 +14,7 @@ use Mailgun\Model\ApiResponse;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class SendResponse implements ApiResponse
+final class SendResponse implements ApiResponse
 {
     /**
      * @var string
diff --git a/src/Mailgun/Model/Message/ShowResponse.php b/src/Mailgun/Model/Message/ShowResponse.php
index 1a1a553..1902d23 100644
--- a/src/Mailgun/Model/Message/ShowResponse.php
+++ b/src/Mailgun/Model/Message/ShowResponse.php
@@ -14,7 +14,7 @@ use Mailgun\Model\ApiResponse;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class ShowResponse implements ApiResponse
+final class ShowResponse implements ApiResponse
 {
     /**
      * Only available with message/rfc2822.
diff --git a/src/Mailgun/Model/Stats/TotalResponseItem.php b/src/Mailgun/Model/Stats/TotalResponseItem.php
index 07dc5b8..cb39c3d 100644
--- a/src/Mailgun/Model/Stats/TotalResponseItem.php
+++ b/src/Mailgun/Model/Stats/TotalResponseItem.php
@@ -12,7 +12,7 @@ namespace Mailgun\Model\Stats;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class TotalResponseItem
+final class TotalResponseItem
 {
     /**
      * @var \DateTime
diff --git a/src/Mailgun/Model/Suppression/Bounce/Bounce.php b/src/Mailgun/Model/Suppression/Bounce/Bounce.php
index 5537782..8489770 100644
--- a/src/Mailgun/Model/Suppression/Bounce/Bounce.php
+++ b/src/Mailgun/Model/Suppression/Bounce/Bounce.php
@@ -12,7 +12,7 @@ namespace Mailgun\Model\Suppression\Bounce;
 /**
  * @author Sean Johnson <sean@mailgun.com>
  */
-class Bounce
+final class Bounce
 {
     /**
      * @var string
diff --git a/src/Mailgun/Model/Suppression/Complaint/Complaint.php b/src/Mailgun/Model/Suppression/Complaint/Complaint.php
index bcfb2ad..60197da 100644
--- a/src/Mailgun/Model/Suppression/Complaint/Complaint.php
+++ b/src/Mailgun/Model/Suppression/Complaint/Complaint.php
@@ -12,7 +12,7 @@ namespace Mailgun\Model\Suppression\Complaint;
 /**
  * @author Sean Johnson <sean@mailgun.com>
  */
-class Complaint
+final class Complaint
 {
     /**
      * @var string
diff --git a/src/Mailgun/Model/Suppression/Unsubscribe/Unsubscribe.php b/src/Mailgun/Model/Suppression/Unsubscribe/Unsubscribe.php
index 0836428..8f70470 100644
--- a/src/Mailgun/Model/Suppression/Unsubscribe/Unsubscribe.php
+++ b/src/Mailgun/Model/Suppression/Unsubscribe/Unsubscribe.php
@@ -12,7 +12,7 @@ namespace Mailgun\Model\Suppression\Unsubscribe;
 /**
  * @author Sean Johnson <sean@mailgun.com>
  */
-class Unsubscribe
+final class Unsubscribe
 {
     /**
      * @var string
diff --git a/src/Mailgun/Model/Tag/Tag.php b/src/Mailgun/Model/Tag/Tag.php
index 1a88ff5..16986c5 100644
--- a/src/Mailgun/Model/Tag/Tag.php
+++ b/src/Mailgun/Model/Tag/Tag.php
@@ -9,7 +9,7 @@
 
 namespace Mailgun\Model\Tag;
 
-class Tag
+final class Tag
 {
     /**
      * @var string
diff --git a/src/Mailgun/Model/Webhook/CreateResponse.php b/src/Mailgun/Model/Webhook/CreateResponse.php
index 88536fe..83bc60c 100644
--- a/src/Mailgun/Model/Webhook/CreateResponse.php
+++ b/src/Mailgun/Model/Webhook/CreateResponse.php
@@ -12,6 +12,6 @@ namespace Mailgun\Model\Webhook;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class CreateResponse extends BaseResponse
+final class CreateResponse extends BaseResponse
 {
 }
diff --git a/src/Mailgun/Model/Webhook/DeleteResponse.php b/src/Mailgun/Model/Webhook/DeleteResponse.php
index 85f2adf..369c6a8 100644
--- a/src/Mailgun/Model/Webhook/DeleteResponse.php
+++ b/src/Mailgun/Model/Webhook/DeleteResponse.php
@@ -12,6 +12,6 @@ namespace Mailgun\Model\Webhook;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class DeleteResponse extends BaseResponse
+final class DeleteResponse extends BaseResponse
 {
 }
diff --git a/src/Mailgun/Model/Webhook/IndexResponse.php b/src/Mailgun/Model/Webhook/IndexResponse.php
index 7d444c4..221ee87 100644
--- a/src/Mailgun/Model/Webhook/IndexResponse.php
+++ b/src/Mailgun/Model/Webhook/IndexResponse.php
@@ -14,7 +14,7 @@ use Mailgun\Model\ApiResponse;
 /**
  * @author Tobias Nyholm <tobias.nyholm@gmail.com>
  */
-class IndexResponse implements ApiResponse
+final class IndexResponse implements ApiResponse
 {
     /**
      * @var array