A new build for the next update to Windows Phone 8.1 has been spotted.

The next two updates to Windows Phone 8.1 are widely known as GDR1 and GDR2 or Update 1 and Update 2.

Now the Windows Phone 8.1 GDR1 with build number 8.10.14140.0 has appeared at the WP Bench site. This is a bump from the previous build version 8.10.14130.0, which was caught in a leak earlier this month, reports NokiaPowerUser.

The previous Windows Phone 8.1 GDR1 build 8.10.14130.0 is said to be a significant improvement over the released version of Windows Phone 8.1 with build number 8.10.12397.895, rolling out as a final update to the Windows Phone 8 users.

As the series of GDR1 build leaks suggest the next update to Windows Phone 8.1 is on its way and might already be in its RTM (Release to Manufacturing) stage.

The GDR1 or the Update 1 is believed to be almost ready with Microsoft expected to release the RTM version to its hardware manufacturing partners and carrier partners for testing earlier this month.

Followed by the testing, the Windows Phone 8.1 GDR1 will be seeded to the developer programme, while the public version of the update will be released once the carrier partners complete testing the software.

The Developer Preview version of Windows Phone 8.1 GDR1 is expected in late August.