Hi,
I just performed an update to the latest version (via confort update)  and apparently there is an issue with the system as it only says:
Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.1.0".
What can I do?
Do I need to reinstall the docker or there is any way I can restore this one?
Thank you
GB

Did you open a support ticket ?
You are in the Community Edition support.
The only advice you can get here are : download previous verison here : github.com/LimeSurvey/LimeSurvey/releases/tag/3.26.0%2B210419

What PHP version is currently used? Looks like you need to update PHP. I recommend to 7.3 or 7.4.

Seems even whith PHP7.3 it broke on some server

forums.limesurvey.org/forum/french-forum...A8s-m%C3%A0j-confort

We released a new version that should fix the issue. If you can't access your admin interface, please contact support and we will provide a patch for you. Thank you.

We have provided an update file to download so you can fix your existing installation.

Please download it at bugs.limesurvey.org/view.php?id=17304#c64483

Thank you. As a matter of fact I cannot access the web interface. I can ssh as root. I guess I can get the attachment from bugs.limesurvey.org/view.php?id=17304#c64483
Should I unzip it in the /var/www/html/ dir overwriting the existing files?
Is this supposed to fix the issue?
Thanks again

There is a clear description on what to do in the bug report:

To fix this please unzip the attached file in your LimeSurvey directory (or upload the files to your webspace overwriting the existing ones). It will replace the critical files and update your instance from build 210517 to 210519.

You need to unzip the file and then copy everthing into your Limesurvey folder, wherever this is on your server.

If your limesurvey is directly installed into the folder /var/www/html/, then it has to go there, if it is /var/www/html/limesurvey/ then there.

But anyway, once you unzipped the folder you will see what files are in this folder and compare it with your limesurvey folder.

I have checked and it contains 3 folders (application, docs, third _party) and one file "composer.json". Have a look at your installation where those folders and files are and copy the new ones there, sustituting the old ones.