1. You can open file /etc/apt/source.list using vi and add a line bellow
deb http://http.kali.org/kail kali-rolling main contrib non-free
deb http://snapshot.debian.org/archive/debian/20091004T111800Z/ lenny main deb-src http://snapshot.debian.org/archive/debian/20091004T111800Z/ lenny main deb http://snapshot.debian.org/archive/debian-security/20091004T121501Z/ lenny/updates main deb-src http://snapshot.debian.org/archive/debian-security/20091004T121501Z/ lenny/updates main
2. After then you install update and upgrade
apt-get update
You may be a long time for upgrade..