diff --git a/Models/SupportApp.php b/Models/SupportApp.php
index d96c055..02b0818 100755
--- a/Models/SupportApp.php
+++ b/Models/SupportApp.php
@@ -66,7 +66,7 @@ class SupportApp implements \JsonSerializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/Ticket.php b/Models/Ticket.php
index f99dc32..e53f0ec 100755
--- a/Models/Ticket.php
+++ b/Models/Ticket.php
@@ -227,7 +227,7 @@ class Ticket
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/TicketAttribute.php b/Models/TicketAttribute.php
index 9051049..a0dce56 100755
--- a/Models/TicketAttribute.php
+++ b/Models/TicketAttribute.php
@@ -97,7 +97,7 @@ class TicketAttribute implements \JsonSerializable, ArrayableInterface
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/TicketAttributeType.php b/Models/TicketAttributeType.php
index ced0f1c..344ac59 100755
--- a/Models/TicketAttributeType.php
+++ b/Models/TicketAttributeType.php
@@ -152,7 +152,7 @@ class TicketAttributeType implements \JsonSerializable, ArrayableInterface
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/TicketAttributeTypeL11n.php b/Models/TicketAttributeTypeL11n.php
index c22f138..47652ea 100755
--- a/Models/TicketAttributeTypeL11n.php
+++ b/Models/TicketAttributeTypeL11n.php
@@ -129,7 +129,7 @@ class TicketAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/TicketAttributeValue.php b/Models/TicketAttributeValue.php
index 2620b9b..fb2eb36 100755
--- a/Models/TicketAttributeValue.php
+++ b/Models/TicketAttributeValue.php
@@ -248,7 +248,7 @@ class TicketAttributeValue implements \JsonSerializable, ArrayableInterface
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/TicketElement.php b/Models/TicketElement.php
index 3621bc1..742815a 100755
--- a/Models/TicketElement.php
+++ b/Models/TicketElement.php
@@ -98,7 +98,7 @@ class TicketElement implements \JsonSerializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }