Packages of MySQL 5.5.38 are now available for Debian 6.0 “Squeeze” on both amd64 and i386 architectures to fix some vulnerabilities and various bugs as well (the latest packaged version was 5.5.31…).
Please note that the Pinba engine has also been rebuilt to be used against this new version.
As usual, please read carefully the full Changelog before upgrading.