diff --git a/Models/Item.php b/Models/Item.php
index db13715..91ba18b 100644
--- a/Models/Item.php
+++ b/Models/Item.php
@@ -87,11 +87,11 @@ class Item
     /**
      * Get created at date time
      *
-     * @return \DateTime
+     * @return \DateTimeImmutable
      *
      * @since 1.0.0
      */
-    public function getCreatedAt() : \DateTimeInterface
+    public function getCreatedAt() : \DateTimeImmutable
     {
         return $this->createdAt;
     }