diff --git a/src/Message.php b/src/Message.php
index 7b5c52d..04a71dd 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -92,26 +92,31 @@ public function __construct(array $data)
         $this->data = $data;
     }
 
+    #[\ReturnTypeWillChange]
     public function getIterator()
     {
         return new \ArrayIterator($this->data);
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetExists($key)
     {
         return isset($this->data[$key]);
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetGet($key)
     {
         return isset($this->data[$key]) ? $this->data[$key] : null;
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetSet($key, $value)
     {
         $this->data[$key] = $value;
     }
 
+    #[\ReturnTypeWillChange]
     public function offsetUnset($key)
     {
         unset($this->data[$key]);