diff --git a/src/flexmeasures_client/s2/cem.py b/src/flexmeasures_client/s2/cem.py
index b13f85af..1cf9ab58 100644
--- a/src/flexmeasures_client/s2/cem.py
+++ b/src/flexmeasures_client/s2/cem.py
@@ -235,13 +235,7 @@ async def get_message(self) -> str:
         """
 
         message = await self._sending_queue.get()
-        await asyncio.sleep(0.3)
-
-        # Pending for pydantic V2 to implement model.model_dump(mode="json") in
-        # PR #1409 (https://github.com/pydantic/pydantic/issues/1409)
-        message = json.loads(message.json())
-
-        return message
+        return message.model_dump(mode="json")
 
     async def activate_control_type(
         self, control_type: ControlType