Perconaannounces the release of Percona Server for MySQL 5.5.54-38.6 on February 1, 2017. Based on MySQL 5.5.54, including all the bug fixes in it, Percona Server for MySQL 5.5.54-38.6 is now the current stable release in the 5.5 series.
Percona Server for MySQL is open-source and free. You can find release details in the 5.5.54-38.6 milestone on Launchpad. Downloads are available here and from the Percona Software Repositories.