Download Kali Linux 2
or if you wish to upgrade your installation to latest Kali 2 release please use following commands in your terminal:
cat << EOF > /etc/apt/sources.list
deb http://http.kali.org/kali sana main non-free contrib
deb http://security.kali.org/kali-security/ sana/updates main contrib non-free
apt-get dist-upgrade # get a coffee, or 10.