You should inform in advance end users that the platform will be stopped. It can be done through mass mail engine and with a side-wide banner.

Check for upgrade

As root, run:

dnf check-update tuleap\*


You should always read the deployment guide instructions before upgrading.

Run as root:

# Stop service
systemctl stop tuleap nginx httpd

# Upgrade packages
dnf update

# Deploy site configurations, run database migration & co
tuleap-cfg site-deploy

# Restart service
systemctl start tuleap nginx httpd

Enjoy all your new features!