Apple has just released iOS 8.4, the latest update to its mobile operating system. The update isn't as wide-ranging as iOS 8.3, but it does add a few notable things—chief among them are a revamped Music app and a fix for a bug where a specific set of characters could crash the operating system. iOS 8.4 is available for the iPhone 4S and newer, the iPad 2 and newer, and the fifth-generation iPod Touch.

The redesigned music app accompanies the launch of Apple Music and the 24-hour, human-curated Beats One radio station, which Apple exec Eddy Cue and a parade of others spent a long, long time unveiling at WWDC earlier this month. The Spotify-esque on-demand streaming station comes with a three-month trial, and when that ends, it will cost $10 a month for individuals or $15 a month for families of up to six people.

Also included in iOS 8.4 are improvements to iBooks, which can now be used for audiobooks. "Made for iBooks" books now work on the iPhone, too. Other improvements include a setting to turn off the auto-night theme, the ability to pre-order books in a series, and various bug fixes.

Finally, iOS 8.4 fixes another problem that "prevented GPS accessories from providing location data," and "fixes an issue where deleted Apple Watch apps could re-install."

iOS 8.4 will likely be the last major update the operating system receives before iOS 9 is released this fall. The new version, which will also be available as a public beta next month, will run on every device that currently runs iOS 8. Among other things, it introduces a more intelligent, context-aware Siri, multitasking for newer iPads, and many refinements for existing apps.