Jeffrey Carleton, a spokesman for the university, says the increase was needed in order to balance the books.
The government froze funding for public universities and introduced a $150 cap to tuition fee hikes in its 2013-14 budget.
Post-Secondary Education Minister Danny Soucy says he's disappointed that St. Thomas University is not abiding by the cap.
But Soucy says the cap is not law, so he needs to review the matter before he decides if there is any action the government can take with the university.
The increase brings the annual cost of a bachelor of arts degree at St. Thomas University to $5,379.