@filippo_carletti
Are you sure that it's updated in the repository. The Software Center shows nothing to update, but:
[root@NethServer ~]# yum list | grep pulled
nethserver-pulledpork.noarch 1.0.1-1.ns6 @nethserver-updates
pulledpork.noarch 0.7.0-2 @nethserver-base
[root@NethServer ~]## yum repolist
Loaded plugins: changelog, fastestmirror, nethserver_events, presto
Loading mirror speeds from cached hostfile
* nethserver-base: mirror.nethserver.org
* nethserver-updates: mirror.nethserver.org
repo id repo name status
centos-base CentOS-6 Base 6,518
centos-updates CentOS-6 Updates 1,370
nethserver-base NethServer 6.7 base 327
nethserver-updates NethServer 6.7 updates 412
repolist: 8,627
[root@NethServer ~]#
Cheers.