This is the procedure:
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Get latest upstream updates:
yum clean all && yum update
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Update NS repositories:
yum install http://packages.nethserver.org/nethserver/7.5.1804/base/x86_64/Packages/nethserver-release-7-6.ns7.noarch.rpm
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Fix NethServer release number
echo 7.5.1804 > /etc/yum/vars/nsrelease
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Update everything again
yum clean all && yum update
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Everything should already work, but as final step, reboot the machine to load the new kernel:
reboot