diff --git a/slixmpp/types.py b/slixmpp/types.py
index 7faee291..7bd2b4fe 100644
--- a/slixmpp/types.py
+++ b/slixmpp/types.py
@@ -96,6 +96,7 @@ ErrorConditions = Literal[
     "not-acceptable",
     "not-allowed",
     "not-authorized",
+    "payment-required",
     "policy-violation",
     "recipient-unavailable",
     "redirect",