Amazon, which has been working to deliver orders faster, says that more than 10 million items now qualify for next-day delivery.

The online shopping giant is in the process of upgrading its Prime membership, which costs $119 a year, to one-day delivery from two-day. Amazon declined to say when the switch will be completed.

Currently, more than 100 million items qualify for two-day delivery through Prime.

Hoping to catch up to Amazon, Walmart rolled out next-day delivery last month. But it’s for much fewer items: Walmart offers next-day delivery on 220,000 products in Phoenix, Las Vegas and Southern California.

It plans to expand it to most of the US by the end of the year.