diff --git a/src/Mailgun/Model/Event/Event.php b/src/Mailgun/Model/Event/Event.php
index 63f6c68..acc3c78 100644
--- a/src/Mailgun/Model/Event/Event.php
+++ b/src/Mailgun/Model/Event/Event.php
@@ -126,7 +126,7 @@ final class Event
      * @param string $id
      * @param float  $timestamp
      */
-    public function __construct($event, $id, $timestamp)
+    private function __construct($event, $id, $timestamp)
     {
         $this->event = $event;
         $this->id = $id;
diff --git a/src/Mailgun/Model/Event/EventResponse.php b/src/Mailgun/Model/Event/EventResponse.php
index 6daa3e0..9bdf369 100644
--- a/src/Mailgun/Model/Event/EventResponse.php
+++ b/src/Mailgun/Model/Event/EventResponse.php
@@ -29,7 +29,7 @@ final class EventResponse implements ApiResponse, PagingProvider
      * @param Event[] $items
      * @param array   $paging
      */
-    public function __construct(array $items, array $paging)
+    private function __construct(array $items, array $paging)
     {
         $this->items = $items;
         $this->paging = $paging;
diff --git a/src/Mailgun/Model/Tag/IndexResponse.php b/src/Mailgun/Model/Tag/IndexResponse.php
index 2697db1..54209fc 100644
--- a/src/Mailgun/Model/Tag/IndexResponse.php
+++ b/src/Mailgun/Model/Tag/IndexResponse.php
@@ -29,7 +29,7 @@ final class IndexResponse implements ApiResponse, PagingProvider
      * @param Tag[] $items
      * @param array $paging
      */
-    public function __construct(array $items, array $paging)
+    private function __construct(array $items, array $paging)
     {
         $this->items = $items;
         $this->paging = $paging;
diff --git a/src/Mailgun/Model/Tag/Tag.php b/src/Mailgun/Model/Tag/Tag.php
index 16986c5..681a969 100644
--- a/src/Mailgun/Model/Tag/Tag.php
+++ b/src/Mailgun/Model/Tag/Tag.php
@@ -37,7 +37,7 @@ final class Tag
      * @param \DateTime $firstSeen
      * @param \DateTime $lastSeen
      */
-    public function __construct($tag, $description, \DateTime $firstSeen = null, \DateTime $lastSeen = null)
+    private function __construct($tag, $description, \DateTime $firstSeen = null, \DateTime $lastSeen = null)
     {
         $this->tag = $tag;
         $this->description = $description;
diff --git a/src/Mailgun/Model/Webhook/BaseResponse.php b/src/Mailgun/Model/Webhook/BaseResponse.php
index 6f722e8..9e7f6c8 100644
--- a/src/Mailgun/Model/Webhook/BaseResponse.php
+++ b/src/Mailgun/Model/Webhook/BaseResponse.php
@@ -32,7 +32,7 @@ abstract class BaseResponse implements ApiResponse
      * @param array  $webhook
      * @param string $message
      */
-    public function __construct(array $webhook, $message)
+    private function __construct(array $webhook, $message)
     {
         $this->webhook = $webhook;
         $this->message = $message;
diff --git a/src/Mailgun/Model/Webhook/ShowResponse.php b/src/Mailgun/Model/Webhook/ShowResponse.php
index 7acb2de..bafd878 100644
--- a/src/Mailgun/Model/Webhook/ShowResponse.php
+++ b/src/Mailgun/Model/Webhook/ShowResponse.php
@@ -24,7 +24,7 @@ class ShowResponse implements ApiResponse
     /**
      * @param array $webhook
      */
-    public function __construct(array $webhook)
+    private function __construct(array $webhook)
     {
         $this->webhook = $webhook;
     }