https://9to5mac.wordpress.com/wp-admin/edit-comments.php10.9.4 June 25

Apple has released another beta of the upcoming 10.9.4 release of its OS X operating system to developers. The new beta has a build number of 13E25. The update is available through Software Update on 10.9.4 systems and can be found on the Mac developer center as well.

The previous build, 13E19, was released on June 19th.