diff --git a/omnisend/includes/Internal/V1/class-client.php b/omnisend/includes/Internal/V1/class-client.php
index f630cdc..d17b690 100644
--- a/omnisend/includes/Internal/V1/class-client.php
+++ b/omnisend/includes/Internal/V1/class-client.php
@@ -52,7 +52,7 @@ public function create_contact( $contact ): CreateContactResponse {
 		}
 
 		$response = wp_remote_post(
-			OMNISEND_CORE_API_V3 . '/contacts',
+			OMNISEND_CORE_API_V5 . '/contacts',
 			array(
 				'body'    => wp_json_encode( $contact->to_array() ),
 				'headers' => array(