Dotdeb.org has released MySQL 5.5.31 packages for Debian 6.0 Squeeze
Packages of MySQL 5.5.31 are now available for Debian 6.0 “Squeeze” on both amd64 and i386 architectures. They fix some serious vulnerabilities and InnoDB-, partition- and replication-related bugs as well.MySQL 5.5.31 for Debian Squeeze