Warning!
Before proceeding, be sure to
create backups site and its database.
You can upgrade PrestaShop to the latest version using the 1-Click Upgrade module.
-
In the side menu in the section "
IMPROVE" ("
IMPROVEMENTS") go to section "
Modules → Module Catalog" ("
Modules → Module catalog"), enter in the search box
1-Click Upgrade
and in the card of the found module, click "
Install" ("
Install"):

In the side menu in the section "
MORE" ("
YET") go to section "
1-Click Upgrade" and in the block "
THE PRE-UPGRADE CHECKLIST" click "
Click here to put your shop under maintenance" ("
Click here to put your store in maintenance mode"):

In the block "
BACKUP OPTIONS" set the switches opposite "
Back up my files and database" and "
Back up my images" into position "
NO":

In the block "
UPGRADE OPTIONS" set the switches opposite "
Disable non-native modules" and "
Upgrade the default theme" into position "
NO" and press "
Save" ("
Save"):

In the block "
START YOUR UPGRADE" in field "
Channel" select the desired update channel, save changes with the button "
Save" and press "
CHECK IF A NEW VERSION IS AVAILABLE":

In the block "
START YOUR UPGRADE" click "
UPGRADE PRESTASHOP NOW!":

Wait for the update to complete.
Go to the maintenance mode management section, set the switch opposite "
Enable Shop" ("
Enable store") to position "
YES" ("
YES") and press "
Save" ("
Save"):

Check the site is working.