Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE shipments ( order_id VARCHAR, shipment_date INTEGER )

### Question ###
Find the id of the order which is shipped most recently.

### Accurate SQL ###

SELECT order_id FROM shipments WHERE shipment_date = (SELECT MAX(shipment_date) FROM shipments)