For first step we need to remove old node:

pvecm delnode pve01

After add new node, we need to update ssh fingerprint. For this we need to execute next commands on each node in cluster:

Remove old fingerprint:

ssh-keygen -f /etc/ssh/ssh_known_hosts -R
ssh-keygen -f /etc/ssh/ssh_known_hosts -R pve01

Add new fingerprint:

ssh-keyscan  -t ssh-rsa 2>/dev/null | tee -a /etc/ssh/ssh_known_hosts
ssh-keyscan  -t ssh-rsa 2>/dev/null | sed 's/' | tee -a /etc/ssh/ssh_known_hosts