diff --git a/src/Model/Customer.php b/src/Model/Customer.php
index 1ff38e5..d47c527 100644
--- a/src/Model/Customer.php
+++ b/src/Model/Customer.php
@@ -39,7 +39,7 @@ class Customer extends User
      *
      * @return CustomerFactory
      */
-    protected static function newFactory(): CustomerFactory
+    protected static function newFactory()
     {
         return CustomerFactory::new();
     }
diff --git a/src/Model/Item.php b/src/Model/Item.php
index 8db2f3f..8ec67e7 100644
--- a/src/Model/Item.php
+++ b/src/Model/Item.php
@@ -91,7 +91,7 @@ class Item extends Model
      *
      * @return ItemFactory
      */
-    protected static function newFactory(): ItemFactory
+    protected static function newFactory()
     {
         return ItemFactory::new();
     }
diff --git a/src/Model/Order.php b/src/Model/Order.php
index c26bf1a..b6630bd 100644
--- a/src/Model/Order.php
+++ b/src/Model/Order.php
@@ -76,7 +76,7 @@ class Order extends Post
      *
      * @return OrderFactory
      */
-    protected static function newFactory(): OrderFactory
+    protected static function newFactory()
     {
         return OrderFactory::new();
     }
diff --git a/src/Model/Product.php b/src/Model/Product.php
index d44271b..c36e218 100644
--- a/src/Model/Product.php
+++ b/src/Model/Product.php
@@ -105,7 +105,7 @@ protected static function boot()
      *
      * @return ProductFactory
      */
-    protected static function newFactory(): ProductFactory
+    protected static function newFactory()
     {
         return ProductFactory::new();
     }