sequelize: order with camelcase column name gives an error

with sequelize version 2.0.0-rc2, my simple sorting, where the db column in postgres is updatedAt, is as follows:

db.MachineRequest.findAll({
      where: { approved: true },
      order: 'updatedAt'
})

It gives me this error - seems like it is always lowercasing it:

Cannot display approved machine requests: SequelizeDatabaseError: error: column "updatedat" does not exist

I have tried putting backtick symbol around updatedAt and it gives the same error:

Any idea how to order by a column name that has camel case? Thanks!