Don't forget to update your recovery partition. Updating through the mac app store or with the delta or combo update will NOT update the recovery partition.
To make the 10.11.3 recovery partition:
1. Download the Lion Recovery Update from
https://support.apple.com/kb/dl1464?locale=en_US . Make sure it is in your downloads folder. Download the full installer for el capitan 10.11.3 from the mac app store, right click on it and click Show Package Contents. Go to Contents/SharedSupport/. Copy the InstallESD.dmg file into your Downloads folder.
2. Download and decompress the file recovery.sh.zip from
http://4unitmaths.com/recovery.sh.zip and move recovery.sh into your Downloads folder if it's not there already.
3. Open Terminal and type the following commands:
chmod +x ~/Downloads/recovery.sh
sudo ~/Downloads/recovery.sh
4. Wait a few minutes for it to finish and return back to a prompt. Reboot with holding down the option key to test your 10.11.3 recovery partition.