Redis 2.8.8 has been released on March 25th 2014, bringing a lot of fixes… Take a look at the Changelog for more details.
The upgrade urgency is high for Redis, low for Sentinel. There is a potentially critical bug fix causing data loss in Redis but it requires a combination of disk full and the use of the SHUTDOWN command.
The packages are now available for both Debian 7.0 “Wheezy” and Debian 6.0 “Squeeze” on both amd64 and i386 architectures.