How Do I Update Metasploit on Kali Linux Rolling?

i am new to kali linux (version 2017.1) and i have tried alot of times to update metasploit bt it never seems to happen.

deb http://http.kali.org/kali kali-rolling main contrib non-free

deb-src http://http.kali.org/kali kali-rolling main contrib non-free

these are my kali linux mirrors. When i apt-get update, apt-get upgrade, apt-get dist-upgrade... its shows dat metasploit frame work is getting updated but when i open it, its still remains as -dev. i even tried msfupdate.

Am i doing something wrong? please i really need help