Use the following commands to upgrade your kali linux to latest 2017.1 rolling version. It has updated its drivers for some Realtek chips and many other updates have been added.

apt-get update

or
$ sudo apt-get update
In Upgrade, apt install newer version of tools, and removed older version. It upgrade only tools.

apt-get upgrade

Or
$ sudo apt-get upgrade
To upgrade newer version of Operating System use following command

apt-get dist-upgrade