NEW YORK   — Two-day delivery is going out of style.

Amazon, which hooked shoppers on getting just about anything shipped in two days, said this week that it will soon promise one-day delivery for its U.S. Prime members on most items.

The company hopes that cutting delivery times in half will make its $119-a-year Prime membership more attractive, since nearly every other online store offers free deliveries in two days. Amazon also can’t compete with Walmart and Target, where ordering online and picking up at a store is becoming more popular with shoppers.

“It is a smart change, but it is also one that is becoming increasingly necessary,” said Neil Saunders, managing director at GlobalData Retail. “Other retailers have really upped their game in terms of delivery.”