Mortgage rates remain at all-time lows even with a slight bump up over the last week.

U.S. average rates on long-term mortgages rose this week but remained at historically low levels.

The key 30-year loan stayed below 3%. Mortgage buyer Freddie Mac reports that the average rate on the 30-year home loan increased to 2.96% from 2.88% last week. The average rate on the 15-year fixed-rate mortgage rose to 2.46% from 2.44% from last week. Mortgage refinancing, which has boomed amid the record low interest rates this year, could cost many homeowners more because of a new fee announced by Freddie Mac and its larger sibling Fannie Mae.