diff --git a/src/Vonage.php b/src/Vonage.php
index 5aefc1e..9369caa 100644
--- a/src/Vonage.php
+++ b/src/Vonage.php
@@ -80,7 +80,7 @@ public function client()
         $signatureCredentials = null;
 
         if ($signatureSecret = $this->config['signature_secret'] ?? null) {
-            $signatureCredentials = new SignatureSecret($this->config['api_key'], $signatureSecret);
+            $signatureCredentials = new SignatureSecret($this->config['api_key'], $signatureSecret, $this->config['signature_method'] ?? 'md5hash');
         }
 
         if ($basicCredentials && $signatureCredentials) {