On May 10, 2019, Jost was again a late inclusion to Team Canada at the 2019 IIHF World Championship, joining the squad following the Avalanche's second round defeat in the post-season. He played his first game in Slovakia, registering two assists in an 8–0 victory over Great Britain on May 12. Jost helped Canada progress through to the playoff rounds before losing the final to Finland to finish with the silver medal on May 26, 2019.