diff --git a/voicebot/main.py b/voicebot/main.py
index ee75d4a..ae5f476 100644
--- a/voicebot/main.py
+++ b/voicebot/main.py
@@ -250,6 +250,38 @@ class IceCandidateModel(BaseModel):
     candidate: ICECandidateDictModel
 
 
+class JoinStatusModel(BaseModel):
+    status: str
+    message: str = ""
+
+
+class UserJoinedModel(BaseModel):
+    name: str
+    session_id: str
+
+
+class ParticipantModel(BaseModel):
+    name: str
+    session_id: str
+    # Add other participant fields as needed based on actual data structure
+
+
+class LobbyStateModel(BaseModel):
+    participants: List[ParticipantModel] = []
+
+
+class UpdateModel(BaseModel):
+    # This can be extended based on the actual update message structure
+    # For now, we'll make it flexible to handle various update types
+    class Config:
+        extra = "allow"
+
+
+class WebSocketMessageModel(BaseModel):
+    type: str
+    data: Dict[str, object] = {}
+
+
 class WebSocketProtocol(Protocol):
     def send(self, message: object, text: Optional[bool] = None) -> Awaitable[None]: ...
     def close(self, code: int = 1000, reason: str = "") -> Awaitable[None]: ...
@@ -620,8 +652,14 @@ class WebRTCSignalingClient:
 
     async def _process_message(self, message: MessageData):
         """Process incoming signaling messages"""
-        msg_type = message.get("type")
-        data = message.get("data", {})
+        try:
+            # Validate the base message structure first
+            validated_message = WebSocketMessageModel.model_validate(message)
+            msg_type = validated_message.type
+            data = validated_message.data
+        except ValidationError as e:
+            logger.error(f"Invalid message structure: {e}", exc_info=True)
+            return
 
         logger.info(
             f"_process_message: Received message type: {msg_type} with data: {data}"
@@ -656,23 +694,36 @@ class WebRTCSignalingClient:
                 return
             await self._handle_ice_candidate(validated)
         elif msg_type == "join_status":
-            dd = cast(MessageData, data)
-            logger.info(f"Join status: {dd.get('status')} - {dd.get('message', '')}")
+            try:
+                validated = JoinStatusModel.model_validate(data)
+            except ValidationError as e:
+                logger.error(f"Invalid join_status payload: {e}", exc_info=True)
+                return
+            logger.info(f"Join status: {validated.status} - {validated.message}")
         elif msg_type == "user_joined":
-            dd = cast(MessageData, data)
+            try:
+                validated = UserJoinedModel.model_validate(data)
+            except ValidationError as e:
+                logger.error(f"Invalid user_joined payload: {e}", exc_info=True)
+                return
             logger.info(
-                f"User joined: {dd.get('name')} (session: {dd.get('session_id')})"
+                f"User joined: {validated.name} (session: {validated.session_id})"
             )
         elif msg_type == "lobby_state":
-            dd = cast(MessageData, data)
-            participants = dd.get("participants", [])
-            if isinstance(participants, list):
-                logger.info(f"Lobby state updated: {len(participants)} participants")
-            else:
-                logger.info("Lobby state updated: participants data received")
+            try:
+                validated = LobbyStateModel.model_validate(data)
+            except ValidationError as e:
+                logger.error(f"Invalid lobby_state payload: {e}", exc_info=True)
+                return
+            participants = validated.participants
+            logger.info(f"Lobby state updated: {len(participants)} participants")
         elif msg_type == "update":
-            dd = cast(MessageData, data)
-            logger.info(f"Received update message: {dd}")
+            try:
+                validated = UpdateModel.model_validate(data)
+            except ValidationError as e:
+                logger.error(f"Invalid update payload: {e}", exc_info=True)
+                return
+            logger.info(f"Received update message: {validated}")
         else:
             logger.info(f"Unhandled message type: {msg_type} with data: {data}")