An update to one of Apple’s iOS developer pages today indicates that the latest version of the company’s mobile operating system has reached 90% adoption among users. That’s up about 15% since December of last year, when three quarters of users had upgraded.

The chart doesn’t break down which version of iOS 7 specifically users are running, but it’s safe to assume that the number of devices running iOS 7.1 has increased significantly since it debuted in March.

Apple revealed the next iteration of iOS, version 8.0, is already three betas into testing and is expected to be launched this fall alongside new iPhone hardware.

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