In mid-June 2012, Papadakis/Cizeron decided to move to Lyon to train with new coaches Muriel Zazoui, Romain Haguenauer, and Olivier Schoenfelder. They competed in their fourth season of the Junior Grand Prix, winning their first title at JGP France and then taking another gold medal at JGP Austria, where they scored their personal best of 142.08 points. Their wins qualified them for the 2012–13 JGP Final in Sochi, Russia. Papadakis/Cizeron won the silver medal in Sochi behind Russian ice dancers Alexandra Stepanova / Ivan Bukin. At the 2013 World Junior Championships in Milan, the French placed second in the short dance. On the day of the free dance, Papadakis sprained her ankle in an off-ice warm up before the morning practice. During the competition, she paused after 2:52 minutes and was allowed a medical break, after which she and Cizeron completed the dance. They placed third in the free dance and second overall, stepping onto the podium along with gold medalists Stepanova/Bukin and bronze medalists Aldridge/Eaton.