diff --git a/Models/QAAnswer.php b/Models/QAAnswer.php
index 16bb896..ccdbe3a 100755
--- a/Models/QAAnswer.php
+++ b/Models/QAAnswer.php
@@ -80,7 +80,7 @@ class QAAnswer implements \JsonSerializable
     /**
      * Created at.
      *
-     * @var \DateTime
+     * @var \DateTimeImmutable
      * @since 1.0.0
      */
     private \DateTimeImmutable $createdAt;
diff --git a/Models/QAQuestion.php b/Models/QAQuestion.php
index ab204db..b8c604b 100755
--- a/Models/QAQuestion.php
+++ b/Models/QAQuestion.php
@@ -81,7 +81,7 @@ class QAQuestion implements \JsonSerializable
     /**
      * Created at.
      *
-     * @var \DateTime
+     * @var \DateTimeImmutable
      * @since 1.0.0
      */
     private \DateTimeImmutable $createdAt;