diff --git a/pybotx/models/sync_smartapp_event.py b/pybotx/models/sync_smartapp_event.py
index 0ab122d0..c7af6a4a 100644
--- a/pybotx/models/sync_smartapp_event.py
+++ b/pybotx/models/sync_smartapp_event.py
@@ -27,7 +27,6 @@ class BotAPISyncSmartAppSender(VerifiedPayloadBaseModel):
 
 
 class BotAPISyncSmartAppPayload(VerifiedPayloadBaseModel):
-    ref: UUID
     data: Dict[str, Any]
     files: List[APIAsyncFile]
 
@@ -82,7 +81,7 @@ def to_domain(self, raw_smartapp_event: Dict[str, Any]) -> SmartAppEvent:
                 "type": "smartapp_rpc",
                 "params": self.payload.data,
             },
-            ref=self.payload.ref,
+            ref=None,
             smartapp_id=self.bot_id,
             opts=None,
             files=[convert_async_file_to_domain(file) for file in self.payload.files],
@@ -92,14 +91,12 @@ def to_domain(self, raw_smartapp_event: Dict[str, Any]) -> SmartAppEvent:
 
 
 class BotAPISyncSmartAppEventResultResponse(UnverifiedPayloadBaseModel):
-    ref: UUID
     data: Any
     files: List[APIAsyncFile]
 
     @classmethod
     def from_domain(
         cls,
-        ref: UUID,
         data: Any,
         files: Missing[List[File]] = Undefined,
     ) -> "BotAPISyncSmartAppEventResultResponse":
@@ -108,7 +105,6 @@ def from_domain(
             api_async_files = [convert_async_file_from_domain(file) for file in files]
 
         return cls(
-            ref=ref,
             data=data,
             files=api_async_files,
         )
@@ -117,7 +113,6 @@ def jsonable_dict(self) -> Dict[str, Any]:
         return {
             "status": "ok",
             "result": {
-                "ref": str(self.ref),
                 "data": self.data,
                 "files": [file.jsonable_dict() for file in self.files],
             },
diff --git a/pybotx/models/system_events/smartapp_event.py b/pybotx/models/system_events/smartapp_event.py
index f372d5e3..1925a4e9 100644
--- a/pybotx/models/system_events/smartapp_event.py
+++ b/pybotx/models/system_events/smartapp_event.py
@@ -37,7 +37,7 @@ class SmartAppEvent(BotCommandBase):
         sender: Event sender.
     """
 
-    ref: UUID
+    ref: Optional[UUID]
     smartapp_id: UUID
     data: Dict[str, Any]  # noqa: WPS110
     opts: Optional[Dict[str, Any]]
diff --git a/tests/conftest.py b/tests/conftest.py
index 6c61c77b..8f57ae1f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -342,7 +342,6 @@ async def handle_sync_smartapp_event(
         _: Bot,
     ) -> BotAPISyncSmartAppEventResultResponse:
         return BotAPISyncSmartAppEventResultResponse.from_domain(
-            ref=event.ref,
             data=event.data,
             files=event.files,
         )
diff --git a/tests/test_end_to_end.py b/tests/test_end_to_end.py
index 96f30679..566b98f0 100644
--- a/tests/test_end_to_end.py
+++ b/tests/test_end_to_end.py
@@ -44,7 +44,6 @@ async def handle_sync_smartapp_event(
     _: Bot,
 ) -> BotAPISyncSmartAppEventResultResponse:
     return BotAPISyncSmartAppEventResultResponse.from_domain(
-        ref=event.ref,
         data=event.data["params"],
         files=event.files,
     )
@@ -429,7 +428,6 @@ def test__web_app__sync_smartapp_event__success(bot: Bot, bot_id: UUID) -> None:
         },
         "method": "list.get",
         "payload": {
-            "ref": "6fafda2c-6505-57a5-a088-25ea5d1d0364",
             "data": {"category_id": 1},
             "files": [
                 {
@@ -459,7 +457,6 @@ def test__web_app__sync_smartapp_event__success(bot: Bot, bot_id: UUID) -> None:
     assert response.json() == {
         "status": "ok",
         "result": {
-            "ref": "6fafda2c-6505-57a5-a088-25ea5d1d0364",
             "data": {"category_id": 1},
             "files": [
                 {