Upgrading ezjail jails from 11.1 to 11.2

[Erwan David]

Hi,

I just upgraded my host system from 11.1 to 11.2 rebooted it (following
https://www.freebsd.org/doc/handbook/jails-ezjail.html) then issued the
command ezjail-admin update -U -s 11.1-RELEASE

However I get a continuous

Run '/usr/sbin/freebsd-update fetch' first.
No updates are available to install.

What should I do to upgrade my jails ?