diff --git a/src/Stripe/StripeGateway.cs b/src/Stripe/StripeGateway.cs
index c516ad0..06f8849 100644
--- a/src/Stripe/StripeGateway.cs
+++ b/src/Stripe/StripeGateway.cs
@@ -113,6 +113,7 @@ public class UpdateStripeCustomer : IPost, IReturn<StripeCustomer>
         public string DefaultCard { get; set; }
         public string Description { get; set; }
         public string Email { get; set; }
+        public string Source { get; set; }
     }
 
     [Route("/customers/{Id}")]