During the following season, 2012–13, Gibson was selected to represent the United States at the 2013 World Junior Ice Hockey Championships. He was the team's primary goaltender throughout the championship, registering a .955 save percentage and a 1.36 goals against average (GAA) in seven games for the eventual gold medal winners. His save percentage led all goaltenders in the tournament and he was named as the tournament's best goaltender. He was also named to the tournament All-Star Team, as well as named the tournament's most valuable player.