MySQL 5.6.21 has been released on September 23rd, 2014, fixing 24 security issues and various bugs affecting previous versions.
Please read the full Changelog fore more details.
The corresponding packages are now available for Debian 7 “Wheezy”, on both amd64 and i386 architectures.
Note : Some people reported having difficulties upgrading from 5.6.19 to 5.6.21. If this is your case, prefer using apt-get dist-upgrade (or equivalent) instead of apt-get upgrade.