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https://pve.proxmox.com/wiki/Downloads# ... latest_5.1

Update a running Proxmox Virtual Environment 5.x to latest 5.1
Here is the howto for the CLI:

Check your sources.list file, should look like this:

deb http://ftp.at.debian.org/debian stretch main contrib

# security updates
deb http://security.debian.org stretch/updates main contrib
The enterprise repository:

cat /etc/apt/sources.list.d/pve-enterprise.list
deb https://enterprise.proxmox.com/debian/pve stretch pve-enterprise
Update your repository and packages:
If you get any errors, your sources.list (or your network) has a problem.

Now upgrade the packages:
Reboot to activate the new Kernel, to check if you got all packages, run 'pveversion -v' and compare your output (all packages should have equal or higher version numbers):

pve-server:~# pveversion -v

proxmox-ve: 5.1-32 (running kernel: 4.13.13-2-pve)
pve-manager: 5.1-41 (running version: 5.1-41/0b958203)
pve-kernel-4.13.13-2-pve: 4.13.13-32
libpve-http-server-perl: 2.0-8
lvm2: 2.02.168-pve6
corosync: 2.4.2-pve3
libqb0: 1.0.1-1
pve-cluster: 5.0-19
qemu-server: 5.0-18
pve-firmware: 2.0-3
libpve-common-perl: 5.0-25
libpve-guest-common-perl: 2.0-14
libpve-access-control: 5.0-7
libpve-storage-perl: 5.0-17
pve-libspice-server1: 0.12.8-3
vncterm: 1.5-3
pve-docs: 5.1-12
pve-qemu-kvm: 2.9.1-5
pve-container: 2.0-18
pve-firewall: 3.0-5
pve-ha-manager: 2.0-4
ksm-control-daemon: 1.2-2
glusterfs-client: 3.8.8-1
lxc-pve: 2.1.1-2
lxcfs: 2.0.8-1
criu: 2.11.1-1~bpo90
novnc-pve: 0.6-4
smartmontools: 6.5+svn4324-1
zfsutils-linux: 0.7.3-pve1~bpo9

pve-server:~#
Important Note

If you already use your Proxmox VE Subscription Key, access to the Enterprise repository works out of the box. For more details about the Proxmox VE repositories, see Package repositories