In the world championships Oleksiak anchored the team in the 4 x 100 m relay, though the team finished just off the podium in fourth place. In the 100 m butterfly Oleksiak just missed the podium getting fourth place when she swam in 56.94, followed by 5th in 50 m fly (25.62, a Canadian record), and 6th in the 100 m freestyle (52.94). However, she won two bronze medals in the mixed relays, after swimming the butterfly leg of the mixed 4 × 100 m medley – with the Canadian team tied for bronze with the Chinese team after Yuri Kisil swam the anchor leg - and as anchor of the 4 × 100 m freestyle.