diff --git a/src/Stream/HeaderStream.php b/src/Stream/HeaderStream.php
index 4cf24b36..b4e1a371 100644
--- a/src/Stream/HeaderStream.php
+++ b/src/Stream/HeaderStream.php
@@ -48,6 +48,10 @@ public function __destruct()
         }
     }
 
+    /**
+     * @return void
+     */
+    #[\ReturnTypeWillChange]
     public function update(SplSubject $subject)
     {
         if ($this->stream !== null) {