If someone at your workplace recently quit, you may be poised for a raise.

With more Americans voluntarily leaving their jobs and confidence about business conditions improving, wages could increase amid this labor-market turnover.

More than 2.5 million U.S. workers resigned in May, a 15 percent increase from a year earlier, based on seasonally adjusted data from the Labor Department. These employees represent about 56 percent of total separations, the highest since November.