Amid sluggish sales, Subway is on its way to a revamp. The sandwich chain will offer new ingredients and sandwiches starting July 13 as a part of its most comprehensive update to its menu.

The Connecticut-based company has seen a decline in revenue after becoming one of the world's largest fast-food chains. According to franchise disclosure documents, Subway's parent company Doctor’s Associates reported 2020 revenue at $689.1 million, down 28% from 2019′s net sales of $958.9 million. Due to the pandemic, Subway reportedly closed 10% of its stores in 2020.

Subway is starting fresh with new 12 new ingredients and a new mobile app to bring back customers. It's calling its new menu changes “Eat Fresh, Refresh."

“How do we get folks to look at the brand again and come back to see us? So we’re making some of the biggest, boldest changes that we’ve made to the brand in decades,” Trevor Haynes, head of Subway’s North American division, told CNBC.

The moves come after other major fast-food chains have shifted to higher quality ingredients or healthy options.

“People were really crying out for food innovation. There hadn’t really been a whole lot of food innovation.” CEO John Chidsey said.

Subway says the goal is to keep its image of a healthier option but still give that “craveability” effect at an affordable price, customers shouldn’t expect any price changes with the improved ingredients.

This July will be the biggest upgrade yet, with its new ingredients.

New sauces, bread, and proteins are expected to be available. Two new bread options have been in development for over two years: Artisan Italian and Hearty Multigrain. Along with adding deli-style sliced ham and turkey, smashed avocado, fresh mozzarella, and a parmesan vinaigrette.

The day before the launch, Subway will close all stores at 6 p.m. to prepare. Subway will have a free sub promotion for customers who arrive between 10 a.m. and noon. The chain will be giving away 1 million sandwiches.

Another part of Subway's revamping includes a recently launched brand-new look for its app. It will allow customers to have a better digital experience where they can see stores with out-of-stock ingredients and improved mobile ordering.