diff --git a/src/Monolog/Utils.php b/src/Monolog/Utils.php
index ed2d45bb..14b76661 100644
--- a/src/Monolog/Utils.php
+++ b/src/Monolog/Utils.php
@@ -11,7 +11,7 @@
 
 namespace Monolog;
 
-class Utils
+final class Utils
 {
     /**
      * @internal