The fifth season of "Slow Horses" is set to premiere on Wednesday, September 24, 2025. The release will start with a two-episode premiere on Apple TV+, followed by weekly episodes until the final episode airs on October 22, 2025. This season will be based on Mick Herron's fifth novel, "London Rules," and all the main cast members are expected to return alongside guest star Nick Mohammed from "Ted Lasso".