diff --git a/src/MyParcelComApi.php b/src/MyParcelComApi.php
index 409edb8..df169ec 100644
--- a/src/MyParcelComApi.php
+++ b/src/MyParcelComApi.php
@@ -1001,6 +1001,7 @@ public function deleteShipmentSurcharge(ShipmentSurchargeInterface $shipmentSurc
      * @throws DateMalformedStringException
      */
     public function getDeliveryDates(
+        string $carrierCode,
         string $serviceCode,
         AddressInterface $address,
         DatetimeInterface $startDate,
@@ -1012,6 +1013,7 @@ public function getDeliveryDates(
             self::PATH_DELIVERY_DATES,
             'post',
             [
+                'carrier_code'         => $carrierCode,
                 'service_code'         => $serviceCode,
                 'service_option_codes' => $serviceOptionCodes,
                 'address'              => [
diff --git a/src/MyParcelComApiInterface.php b/src/MyParcelComApiInterface.php
index 1949c59..a48b50b 100644
--- a/src/MyParcelComApiInterface.php
+++ b/src/MyParcelComApiInterface.php
@@ -265,6 +265,7 @@ public function generateManifestForCollection(CollectionInterface $collection):
      * Get delivery date time windows from a carrier for the provided service.
      * Accepts an optional array of `delivery-window` service option codes
      *
+     * @param string            $carrierCode
      * @param string            $serviceCode
      * @param AddressInterface  $address
      * @param DateTimeInterface $startDate
@@ -280,6 +281,7 @@ public function generateManifestForCollection(CollectionInterface $collection):
      * @throws DateMalformedStringException
      */
     public function getDeliveryDates(
+        string $carrierCode,
         string $serviceCode,
         AddressInterface $address,
         DatetimeInterface $startDate,
diff --git a/tests/Feature/MyParcelComApi/DeliveryDatesTest.php b/tests/Feature/MyParcelComApi/DeliveryDatesTest.php
index 27f3367..5ff6ba3 100644
--- a/tests/Feature/MyParcelComApi/DeliveryDatesTest.php
+++ b/tests/Feature/MyParcelComApi/DeliveryDatesTest.php
@@ -23,6 +23,7 @@ public function testItRetrievesDeliveryDates(): void
             ->setStreetNumber(221);
 
         $deliveryDates = $this->api->getDeliveryDates(
+            'carrier-code',
             'service-code',
             $address,
             new DateTime(),