diff --git a/Models/Report.php b/Models/Report.php
index 1fe71a9..29aa4bc 100755
--- a/Models/Report.php
+++ b/Models/Report.php
@@ -171,7 +171,7 @@ class Report implements \JsonSerializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }
diff --git a/Models/Template.php b/Models/Template.php
index ebf7d61..d172731 100755
--- a/Models/Template.php
+++ b/Models/Template.php
@@ -334,7 +334,7 @@ class Template implements \JsonSerializable
     /**
      * {@inheritdoc}
      */
-    public function jsonSerialize()
+    public function jsonSerialize() : mixed
     {
         return $this->toArray();
     }