Starbucks is requiring some remote workers to return to its headquarters and increasing the number of days that corporate employees are required to work in an office.

In a letter to employees posted on Monday, Starbucks Chairman and CEO Brian Niccol said corporate employees would need to be in the office four days a week starting in early October instead of three days a week.

The Seattle-based company said that all corporate “people leaders” must be based in either Seattle or Toronto within 12 months. That is a change from February, when it required vice presidents to relocate to Seattle or Toronto.