WASHINGTON — U.S. employers advertised slightly more jobs in May and hired more workers, further signs of steady improvement in the job market.

The Labor Department said Tuesday that job openings rose 28,000 to 3.83 million in May from April. That’s close to February’s 3.9 million, which was the highest in five years. A measure of overall hiring increased 46,000 to 4.4 million. That’s still lower than a year ago.

The job market remains competitive, despite stronger hiring this year. There are nearly 3.1 unemployed, on average, for each open job. That’s down from a peak four years ago of nearly 7 to 1. In a healthy economy, the ratio is typically 2 to 1.

The Job Openings and Labor Turnover survey comes after the government said last week that employers added 195,000 net jobs in June. The unemployment rate was unchanged at still-high 7.6 percent.

In May, nearly all the openings were at retail businesses, a sign that many of the jobs are low paying.