Launched nearly five months ago, the iPhone 5 is losing steam, at least according to one analyst. Jefferies’ Peter Misek said that sales of Apple’s current handset are “decelerating faster than expected,” according to Business Insider.

According to Misek, Apple has cut the company’s build order for the iPhone 5 to 30 million, which is down from 40 million units.

He states that “suppliers seem to be prepping for iPhone 5S builds to start in March.”

The most recent rumors suggest that the next iPhone will launch in June. If it does, it will be Apple’s first handset to debut in early summer since the iPhone 4 debuted in June 2010. The company’s two most current models, the iPhone 4S, and iPhone 5 debuted in October and September, respectively.