An untitled I Know What You Did Last Summer sequel is an upcoming American slasher film directed by Jennifer Kaytin Robinson, who co-wrote the screenplay with Sam Lansky after an initial draft by Leah McKendrick. It is the fourth film in the I Know What You Did Last Summer franchise, serving as a direct sequel to I Still Know What You Did Last Summer (1998). The film stars Madelyn Cline, Sarah Pidgeon, Tyriq Withers, Jonah Hauer-King and Chase Sui Wonders, with Jennifer Love Hewitt and Freddie Prinze Jr. reprising their roles as Julie James and Ray Bronson from the first two films.

Produced by Columbia Pictures in association with Original Film, a Mandalay Pictures production, it is scheduled to be released by Sony Pictures Releasing in the United States on July 18, 2025.