Mortgage rates rose to the highest level in more than a year, mortgage buyer Freddie Mac said Thursday.

Freddie Mac’s latest Primary Mortgage Market Survey, released Thursday, showed the average rate on the benchmark 30-year fixed mortgage rose to 6.71% from last week’s reading of 6.66%. 

The average rate on a 30-year loan was 6.5% a year ago.

“Purchase demand has remained relatively stable indicating steady interest from buyers adapting to evolving market conditions,” said Sam Khater, Freddie Mac’s chief economist.

The average rate on a 15-year fixed mortgage rose to 6.04% from last week’s reading of 5.98%.

Mortgage rates are affected by several factors, including the Federal Reserve and geopolitics. Though mortgage rates are not directly affected by the Fed’s interest rate decisions, they closely track the 10-year Treasury yield. The 10-year yield hovered around 4.74% as of Thursday afternoon.