A shakeup to the Starbucks rewards program for customers using their own cups is the latest change under CEO Brian Niccol.

Starbucks is ready to shake up its rewards program next month by adding a new way to get extra stars. But the benefit won't necessarily apply to every customer who walks through the door. The coffee chain has a long history of operating its Rewards program. Members of the free program have an opportunity to collect stars with every purchase.

Starbucks is changing one of the most generous parts of its loyalty program, marking the latest effort by CEO Brian Niccol to boost profits.