The best-selling Windows Phone handset ever may finally be getting a successor. Nokia first launched the entry-level Lumia 520 in Feb. 2013, and it looks the company is hard at work on a Lumia 530 follow-up. The news comes from @evleaks, who has a proven track record when it comes to scooping smartphone launches, and notes that the device is apparently being called the Nokia Rock internally.

Nokia spent Mobile World Congress announcing its new line of Android-powered Nokia X smartphones, so we’re guessing the new Windows Phone device is still in development. The Lumia 530 could be released next month as part of Microsoft’s new lineup of Windows Phone 8.1 handsets, though it’s possible the “Nokia Rock” could arrive even sooner. It’s also worth noting the Finnish company has yet to confirm a Lumia 520 follow-up. This is still just a rumor.

The Lumia 520 offers a 4-inch 480 x 800-display, a Snapdragon dual-core processor, a 5-megapixel camera, 512MB of RAM, and 8GB of expandable storage. If Nokia wants the Lumia 530 to compete against a new generation of entry-level Android devices as well as Apple’s latest low-end push with the release of a cheaper 8GB iPhone 5c model, the company really needs to beef up its specs for the Lumia 530. Hopefully we’ll see a sharper display and improved camera along with the still-unreleased Windows Phone 8.1 OS.