diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a7bcaf..7065204 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 4.2.0 - 2022-08-04
+
+### Added
+
+- `externalId` attribute to orders
+
 ## 4.1.2 - 2022-06-30
 
 ### Added
diff --git a/src/MpApiClient.php b/src/MpApiClient.php
index 4f92562..07dfeb6 100644
--- a/src/MpApiClient.php
+++ b/src/MpApiClient.php
@@ -29,7 +29,7 @@ final class MpApiClient implements ClientInterface, MpApiClientInterface
 {
 
     const APP_NAME    = 'mp-api-client';
-    const APP_VERSION = '4.1.2';
+    const APP_VERSION = '4.2.0';
 
     private BrandClientInterface       $brandClient;
     private CategoryClientInterface    $categoryClient;
diff --git a/src/Order/Entity/BasicOrder.php b/src/Order/Entity/BasicOrder.php
index 620cc15..5080cb3 100644
--- a/src/Order/Entity/BasicOrder.php
+++ b/src/Order/Entity/BasicOrder.php
@@ -14,6 +14,7 @@ final class BasicOrder implements JsonSerializable
     use JsonSerializeEntityTrait;
 
     private int                $id;
+    private ?string            $externalId;
     private int                $purchaseId;
     private int                $customerId;
     private string             $customer;
@@ -32,6 +33,7 @@ final class BasicOrder implements JsonSerializable
 
     private function __construct(
         int $id,
+        ?string $externalId,
         int $purchaseId,
         int $customerId,
         string $customer,
@@ -49,6 +51,7 @@ private function __construct(
         bool $mdpSpectrum
     ) {
         $this->id             = $id;
+        $this->externalId     = $externalId;
         $this->purchaseId     = $purchaseId;
         $this->customerId     = $customerId;
         $this->customer       = $customer;
@@ -76,6 +79,7 @@ public static function createFromApi(array $data): self
     {
         return new self(
             (int) $data['id'],
+            $data['external_id'] ?? null,
             (int) $data['purchase_id'],
             (int) $data['customer_id'],
             (string) $data['customer'],
@@ -99,6 +103,11 @@ public function getId(): int
         return $this->id;
     }
 
+    public function getExternalId(): ?string
+    {
+        return $this->externalId;
+    }
+
     public function getPurchaseId(): int
     {
         return $this->purchaseId;
diff --git a/src/Order/Entity/Order.php b/src/Order/Entity/Order.php
index 5c5e85e..68ae465 100644
--- a/src/Order/Entity/Order.php
+++ b/src/Order/Entity/Order.php
@@ -14,6 +14,7 @@ final class Order implements JsonSerializable
     use JsonSerializeEntityTrait;
 
     private int                              $id;
+    private ?string                          $externalId;
     private int                              $purchaseId;
     private string                           $currency;
     private float                            $deliveryPrice;
@@ -53,6 +54,7 @@ final class Order implements JsonSerializable
 
     private function __construct(
         int $id,
+        ?string $externalId,
         int $purchaseId,
         string $currency,
         float $deliveryPrice,
@@ -91,6 +93,7 @@ private function __construct(
         ConsignmentStatusHistoryIterator $consignmentStatusHistory
     ) {
         $this->id                       = $id;
+        $this->externalId               = $externalId;
         $this->purchaseId               = $purchaseId;
         $this->currency                 = $currency;
         $this->deliveryPrice            = $deliveryPrice;
@@ -139,6 +142,7 @@ public static function createFromApi(array $data): self
     {
         return new self(
             (int) $data['id'],
+            $data['external_id'] ?? null,
             (int) $data['purchase_id'],
             (string) $data['currency'],
             (float) $data['delivery_price'],
@@ -183,6 +187,11 @@ public function getId(): int
         return $this->id;
     }
 
+    public function getExternalId(): ?string
+    {
+        return $this->externalId;
+    }
+
     public function getPurchaseId(): int
     {
         return $this->purchaseId;
diff --git a/tests/functional/OrderClientCest.php b/tests/functional/OrderClientCest.php
index cee48b1..6fc4b8f 100644
--- a/tests/functional/OrderClientCest.php
+++ b/tests/functional/OrderClientCest.php
@@ -56,6 +56,9 @@ public function testList(FunctionalTester $I): void
 
         foreach ($orders as $order) {
             $I->assertIsInt($order->getId());
+            if ($order->getExternalId() !== null) {
+                $I->assertIsString($order->getExternalId());
+            }
             $I->assertIsInt($order->getPurchaseId());
             $I->assertIsInt($order->getCustomerId());
             $I->assertIsString($order->getCustomer());