Upwork the largest freelancing website, today released its newest quarterly index of the hottest skills in the U.S. freelance job market. The Upwork Skills Index ranks the site’s 20 fastest-growing skills in a quarterly series. It sheds light on new and emerging skills and provides real-time validation of current trends in the labor market and tech industry.

According to a new report, staffing firms believe talent scarcity is the biggest inhibitor to their business today and will still be the biggest inhibitor 10 years from now.

“Businesses are placing a greater emphasis on skills training, investing in the workforces they have today