diff --git a/src/CaptchaService.php b/src/CaptchaService.php
index 1c5a608..7680148 100644
--- a/src/CaptchaService.php
+++ b/src/CaptchaService.php
@@ -17,7 +17,7 @@ final readonly class CaptchaService
         try {
             $post = [];
             if (!is_null($userAgent)) {
-                $post['user_ageng'] = $userAgent;
+                $post['user_agent'] = $userAgent;
             }
 
             $response = Http::withHeaders([