diff --git a/agenda/conference.py b/agenda/conference.py
index 19e77bf..6123afe 100644
--- a/agenda/conference.py
+++ b/agenda/conference.py
@@ -37,6 +37,7 @@ class Conference:
     cfp_url: str | None = None
     free: bool | None = None
     hackathon: bool | None = None
+    ticket_type: str | None = None
 
     @property
     def display_name(self) -> str: