diff --git a/src/Api/HttpApi.php b/src/Api/HttpApi.php
index a347c01..d7c28c3 100644
--- a/src/Api/HttpApi.php
+++ b/src/Api/HttpApi.php
@@ -99,6 +99,8 @@ abstract class HttpApi
                 throw HttpClientException::conflict($response);
             case 413:
                 throw HttpClientException::payloadTooLarge($response);
+            case 429:
+                throw HttpClientException::tooManyRequests($response);
             case 500 <= $statusCode:
                 throw HttpServerException::serverError($statusCode);
             default:
diff --git a/src/Exception/HttpClientException.php b/src/Exception/HttpClientException.php
index 8067e44..f073f7b 100644
--- a/src/Exception/HttpClientException.php
+++ b/src/Exception/HttpClientException.php
@@ -88,6 +88,11 @@ final class HttpClientException extends \RuntimeException implements Exception
         return new self('Payload too large, your total attachment size is too big.', 413, $response);
     }
 
+    public static function tooManyRequests(ResponseInterface $response)
+    {
+        return new self('Too many requests.', 429, $response);
+    }
+
     public static function forbidden(ResponseInterface $response)
     {
         $body = $response->getBody()->__toString();