Starting from January 2021, when older CyberPanel versions are updated, an error appears as a warning even though the update completes. On all servers with CyberPanel, the update can be performed without issues if you run the command below before updating.
The error given is as follows;
You should consider upgrading via the '/usr/local/CyberCP/bin/python3 -m pip install --upgrade pip' command.
Command required to fix it:
/usr/local/CyberPanel/bin/python3 -m pip install --upgrade pip