diff --git a/tableauserverclient/models/user_item.py b/tableauserverclient/models/user_item.py
index 80cac09ce..49a048f69 100644
--- a/tableauserverclient/models/user_item.py
+++ b/tableauserverclient/models/user_item.py
@@ -14,6 +14,7 @@ class Roles:
         UnlicensedWithPublish = 'UnlicensedWithPublish'
         Viewer = 'Viewer'
         ViewerWithPublish = 'ViewerWithPublish'
+        Guest = 'Guest'
 
     class Auth:
         SAML = 'SAML'