[Samba] Update Samba4 version

[Ricardo Pardim Claus]

Dear, 
I have three installations of Samba 4, version 4.4.5. 
Being two DC's and a file server (domain member). 
I would like to update Samba to the latest version. 

The current installation was done by compiling the Samba packages. 
Could someone tell me if I can upgrade directly to the latest version available? 
Should I compile the new package to overlap the previous version? 
Thank you!