Snap update from 0.74.3 to 1.0.2



We are using Rocket Chat 0.74.3 on Ubuntu 18.04 x64.

The installation has been done using snap.

When I execute “snap refresh rocketchat-server”, snap reply:

le snap “rocketchat-server” n’a aucune mise à jour disponible (french install)

So how can I upgrade to 1.0.2 using snap ?

Thanks for your help