New York CNN Business  — 

Chipotle is having a tech revolution.

The Mexican chain has added a second line to its stores that field only digital orders, and it’s testing out “Chipotlanes,” which let customers order online and pick up through a drive-thru lane in some stores. It offers delivery through its app and delivery platforms.

In the last three months of 2018, Chipotle’s digital sales grew 66%.

“We are definitely under a digital transformation at Chipotle,” CEO Brian Niccol told CNN’s Christine Romans.

Niccol became CEO about a year ago, replacing Chipotle founder and chairman Steve Ells.

MIAMI, FL - APRIL 27:  Chipotle restaurant workers fill orders for customers on the day that the company announced it will only use non-GMO ingredients in its food on April 27, 2015 in Miami, Florida.  The company announced, that the Denver-based chain would not use the GMO's, which is an organism whose genome has been altered via genetic engineering in the food served at Chipotle Mexican Grills.  (Photo by Joe Raedle/Getty Images)
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He was tasked with turning the company around after a difficult period. Customers were hesitant to trust the restaurant following an E. coli outbreak that made 60 Chipotle (CMG) customers in 14 states ill in late 2015 and early 2016. Chipotle (CMG) also struggled to contain several norovirus incidents in its restaurants over the past few years.

In addition to focusing on digital improvements, Niccol is highlighting the company’s real ingredients and pushing out menu innovations like diet-friendly bowls.

The efforts are working. The company’s stock has risen about 35% over the past year, and sales are growing. In the fourth quarter of last year, comparable restaurant sales grew 6%.

As far as a turnaround goes, “we’re definitely just getting started,” he said. “There’s still so much opportunity in front of us, and there’s still a lot of work to be done.”