how to upgrade samba 4.0.4 to 4.1.7

Hello,

I want to do an update of samba4 4.0.4 to version 4.1.7.
How?

I do a update server for dependencies before?

I'm lost

Virtual Server Configuration:
PDC
RHEL 6.4
100 users
15 shares
samba 4.0.4

Thank you for your help.