Washington state’s minimum wage will increase to $9.32 per hour starting Jan. 1, the Department of Labor & Industries announced Monday, Sept. 30.

Next year’s minimum wage is a 13-cent increase from the current $9.19 per hour, which L&I says reflects a 1.455 percent increase in the Consumer Price Index for Urban Wage Earners and Clerical Workers over a 12-month period ending Aug. 31.

The index measures average price changes for goods and services purchased by urban-wage earners and clerical workers. The goods and services it monitors include basic living costs such as food, clothing, shelter, fuels and services such as doctor visits.

Washington will maintain the highest minimum wage in the country. It is one of 10 states that adjusts its minimum wage based on inflation and the price index, the other being: Arizona, Colorado, Florida, Missouri, Montana, Nevada, Ohio, Oregon and Vermont.

Oregon, which recently announced a 15 cent minimum wage increase to $9.10 starting next year, had the second-highest minimum wage in the U.S.

Washington’s minimum wage applies to workers in both agricultural and non-agricultural jobs, although 14  15-year-olds may be paid 85 percent of the adult minimum wage, or $7.92 per hour in 2014.