diff --git a/src/Common/Auth/AuthHandler.php b/src/Common/Auth/AuthHandler.php
index e5a4e286a..de396cc0e 100644
--- a/src/Common/Auth/AuthHandler.php
+++ b/src/Common/Auth/AuthHandler.php
@@ -4,7 +4,7 @@
 
 namespace OpenStack\Common\Auth;
 
-use function GuzzleHttp\Psr7\modify_request;
+use GuzzleHttp\Psr7\Utils;
 use Psr\Http\Message\RequestInterface;
 
 /**
@@ -53,7 +53,7 @@ public function __invoke(RequestInterface $request, array $options)
 
         $modify = ['set_headers' => ['X-Auth-Token' => $this->token->getId()]];
 
-        return $fn(modify_request($request, $modify), $options);
+        return $fn(Utils::modifyRequest($request, $modify), $options);
     }
 
     /**