You can download the latest version from the official page and follow the instructions inside the compression file for installation.
Alternatively, if you want to use debian repositories, you can add
deb http://ftp.us.debian.org/debian testing main contrib non-free
in the file /etc/apt/source.list
Also add
Package: * Pin: release n=testing Pin-Priority: 500
in / etc / apt / preferences
In this case, you will have all the packages for the test version, but they will not be installed if you do not specify them, so run
apt-get update apt-get install <package name>=<version>
eg
apt-get install phpmyadmin=3.4.10.1-1
you can check different versions with
apt-cache showpkg phpmyadmin
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