ALTER COLUMN to change GENERATED ALWAYS AS expression?

Hi all,
I have a column defined GENERATED ALWAYS AS {my_expression} STORED. I’d like to change the {my_expression} part. After reading the documentation for ALTER TABLE (https://www.postgresql.org/docs/current/sql-altertable.html) and trying a few things that resulted in syntax errors, there doesn’t seem to be a way to alter the column’s GENERATED expression in place. It seems like my only option is to drop and re-add the column. Is that correct? 

Thanks
Philip