NEW YORK — Walmart is expanding its grocery delivery service with ride-hailing service Uber to two more markets — Dallas and Orlando, Fla.

The world’s largest retailer launched a pilot grocery service with Uber Technologies last year in Phoenix and then Tampa earlier this year. The delivery charge is $9.95

The move, announced Monday, marks the latest steps that Walmart is taking to offer more options for online grocery shoppers amid increasing competition from online leader Amazon.com. The stakes are getting higher with Amazon’s announcement in June to buy Whole Foods Market.

The Bentonville, Ark.-based discounter operates its own grocery delivery system in San Jose, Calif., and Denver. It also has curbside grocery pick up service for online shoppers at more than 900 of its stores.