# ask-community


12/28/2022, 6:16 PM
Hi Jim - what I suspect is happening here is a version issue where the celery workers are using an earlier version of Dagster that doesn't recognize that step
Is it possible to double-check what version of dagster the celery workers have installed? That error is consistent with it being something earlier than 0.15.1 when the event type was introcued

Jim Nisivoccia

12/28/2022, 6:22 PM
Hey Daniel, it seems on this deployment of dagster, our celery worker version is not updated to the latest that we have defined in our build. A new docker build with the proper versions should fix the issue, I will keep you posted. Thanks a lot!
condagster 1