The highly-rated 18-year old midfielder has penned a fresh deal which will keep him at Tanandice until May 2017.
"Ryan is showing his commitment to the club by signing this contract. We are trying to build something special here and securing Ryan on a longer deal signals our desire to achieve this," said Terrors boss Jackie McNamara.
"He is a fantastic talent who appreciates that Dundee United is the best place for him to develop at this time. Dundee United fans will quite rightly be delighted at this news and how the club is moving forward just now."
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