diff --git a/src/Request.php b/src/Request.php
index 211486c..6d9c3a8 100755
--- a/src/Request.php
+++ b/src/Request.php
@@ -725,7 +725,7 @@ public static function getReferer(): ?string
      */
     public static function getUserAgent(): ?string
     {
-        return Headers::get('HTTP_USER_AGENT');
+        return Headers::get('USER-AGENT');
     }
 
     /**