Last updated: May 20, 2015 14:34
Jack, who had a year to go on his previous deal, looked to be on his way out of the club after contract talks had stalled.
However, now he joins other first-team stars such as Niall McGinn, Adam Rooney and Jonny Hayes in committing his future to the club.
An elated manager Derek McInnes said: “We are all delighted Ryan has committed to the club until the end of season 2016/2017.
“It shows real intent from Ryan to play his part in a successful Aberdeen team. It also demonstrates the club can hold on to its good players as well and hopefully Ryan can continue to impress in an Aberdeen shirt next season.”
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