[3][4] On 26 June 2024 Dubois was elevated to full IBF champion after Oleksandr Usyk vacated the belt.

[5] It was announced that he would be making his first defence of the title against former two-time unified champion Anthony Joshua at Wembley Stadium in London on 21 September.

Dubois retained his title by defeating Joshua by KO in the fifth round after a dominant performance.

Joshua was able to beat the count, but seemed to be on unsteady legs as the bell signalled the end of the first round.

The fourth round saw Joshua hit the canvas twice more, although one of those occasions was ruled a slip.