Why your credit card rates could be going up soon

American Express Co. Credit Cards & Signage Ahead Of Earns Figures
American Express Co. credit cards are arranged for a photograph in New York, U.S., on Monday, April 15, 2013. American Express Co., the biggest U.S. credit-card issuer by purchases, named Edward P. Gilligan to become its president, effective immediately. Photographer: Scott Eells/Bloomberg via Getty Images
Photograph by Scott Eells — Bloomberg via Getty Images

If you’ve got an American Express card, you may see an uptick on your bill pretty soon.

The credit card company is raising rates on more than 1 million cards, Bloomberg reports. Annual rates for some customers will climb by an average of 2.5 percentage points, for a total of at 12.99% at the lowest.

Bloomberg notes that American Express sent letters to the customers affected explaining that the changes were made because the company discovered that rates for its cards were below that of its competitors.

This is American Express’ first rate bump in more than five years.