diff --git a/pybotx/models/system_events/conference_changed.py b/pybotx/models/system_events/conference_changed.py
index 786486b4..48754e18 100644
--- a/pybotx/models/system_events/conference_changed.py
+++ b/pybotx/models/system_events/conference_changed.py
@@ -55,7 +55,7 @@ class ConferenceChangedEvent(BotCommandBase):
     members: list[UUID]
     name: str
     operation: str
-    sip_number: int
+    sip_number: int | None
     start_at: datetime
 
 
@@ -73,7 +73,7 @@ class BotAPIConferenceChangedData(VerifiedPayloadBaseModel):
     members: list[UUID]
     name: str
     operation: str
-    sip_number: int
+    sip_number: int | None
     start_at: datetime
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 17179d71..e51a668d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pybotx"
-version = "0.76.1"
+version = "0.76.2"
 description = "A python library for interacting with eXpress BotX API"
 authors = [
     "Sidnev Nikolay <nsidnev@ccsteam.ru>",