The twin brothers made the announcement Friday.
"One more year!" Andrew Harrison tweeted.
Earlier, Yahoo Sports reported that the twins were staying in school.
The Harrisons helped the Wildcats reach the NCAA title game earlier this month. Previously, forwards Willie Cauley-Stein, Alex Poythress and Marcus Lee, and center Dakari Johnson also announced they are staying.
Aaron averaged 13.7 points last season while Andrew averaged 10.9.