curl https://install.yunohost.org/switchtoTesting | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   462  100   462    0     0   3818      0 --:--:-- --:--:-- --:--:--  3786
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Patching sources.list to enable testing repository...
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Running 'apt-get update'
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Hit:1 http://security.debian.org/debian-security buster/updates InRelease
Hit:2 http://forge.yunohost.org/debian buster InRelease
Hit:3 http://asi-fs-d.contabo.net/debian buster InRelease
Hit:4 http://asi-fs-d.contabo.net/debian buster-updates InRelease
Hit:5 https://packages.sury.org/php buster InRelease
Get:6 https://download.docker.com/linux/debian buster InRelease [54.0 kB]
Fetched 54.0 kB in 1s (51.0 kB/s)
Reading package lists... Done
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Running 'apt-get dist-upgrade'
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Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  moulinette ssowat yunohost yunohost-admin
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.