diff --git a/src/Models/AbstractHolder.php b/src/Models/AbstractHolder.php
index 4cd0edf..beb9aee 100644
--- a/src/Models/AbstractHolder.php
+++ b/src/Models/AbstractHolder.php
@@ -52,6 +52,7 @@ public function toArray(): array
     /**
      * @return TEntry[]
      */
+    #[\ReturnTypeWillChange]
     public function jsonSerialize(): array
     {
         return $this->toArray();