On 27 July 2013, Langerak won the 2013 DFL-Supercup with Dortmund 4–2 against rivals Bayern Munich.
On 18 September 2013, Langerak made his Champions League debut against Napoli after Weidenfeller was sent off. He broke two front teeth in collision with a goalpost in an unsuccessful attempt to stop Lorenzo Insigne scoring.
Langerak made his debut for Australia in an international friendly against France on 12 October 2013, a match in which the Socceroos were thrashed 6–0, courtesy of goals from Franck Ribéry, Olivier Giroud, Yohan Cabaye, Mathieu Debuchy and Karim Benzema. This match turned out to be manager Holger Osieck's final match in charge of Australia, with his sacking coming shortly after the conclusion of the match. Langerak made his second appearance for Australia against Canada, a match which Australia won 3–0, courtesy of goals from Joshua Kennedy, Dario Vidošić and Mathew Leckie. Langerak was included in the 23 man squad going to Brazil for the 2014 FIFA World Cup. He was also included in Australia's final list for 2015 AFC Asian Cup, being held in Australia, but he didn't play any match even Australia's triumph at the 2015 Asian Cup.