pi@raspberrypi:~ $ sudo rpi-update
 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
 *** Performing self-update
 *** Relaunching after update
 *** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
This update bumps to rpi-4.4.y linux tree
Be aware there could be compatibility issues with some drivers
Discussion here:
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=144087
##############################################################
 *** Downloading specific firmware revision (this will take a few minutes)
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   168    0   168    0     0     61      0 --:--:--  0:00:02 --:--:--    61
100 51.1M  100 51.1M    0     0   399k      0  0:02:11  0:02:11 --:--:--  211k
 *** Updating firmware
 *** Updating kernel modules
 *** depmod 4.4.16+
 *** depmod 4.4.16-v7+
 *** Updating VideoCore libraries
 *** Using HardFP libraries
 *** Updating SDK
 *** Running ldconfig
 *** Storing current firmware revision
 *** Deleting downloaded files
 *** Syncing changes to disk
 *** If no errors appeared, your firmware was successfully updated to e7178c06ac5b527085ceb380aa56f1ed52558ea0
 *** A reboot is needed to activate the new firmware
pi@raspberrypi:~ $ sudo reboot
Connection to 192.168.1.105 closed by remote host.
Connection to 192.168.1.105 closed.
saint@saint-laptop:~$ ssh [email protected]
[email protected]'s password:

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Mon Aug  1 00:19:27 2016 from 192.168.1.103
pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.4.16+ #899 Thu Jul 28 12:36:19 BST 2016 armv6l GNU/Linux