When does Slow Horses return?

The first five series have adapted the novels Slow Horses, Dead Lions, and London. The series premiered on Apple TV+ on 1 April 2022 to highly positive reviews.
Slough House is an administrative purgatory for MI5 service rejects who have bungled their job but have not been sacked. Those consigned there are known as "slow horses" - a pun on "Slough House" They are expected to endure dull, paper-pushing tasks, along with occasional mental abuse from their miserable boss, Jackson Lamb.