Debian 7 “Wheezy” LTS Updates
Debian 7 “Wheezy” Is managed by the LTS (Long Term Support) team. Who are responsible for security updates on wheezy until May 2018. To continue to receive updates you will need to update your sources.list.
vi /etc/apt/sources.list
Add the following to your sources.list file
deb http://httpredir.debian.org/debian/ wheezy main contrib non-free deb-src http://httpredir.debian.org/debian/ wheezy main contrib non-free deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free deb http://httpredir.debian.org/debian/ wheezy-updates main contrib non-free deb-src http://httpredir.debian.org/debian/ wheezy-updates main contrib non-free
Next update and upgrade your distro.
sudo apt-get update
sudo apt-get upgrade