Take backup of your code and database.
For Drupal update, you need to download core drupal. Please follow below steps.
Step 1: Drupal Core Download. Check below link
Step 2: Check for update
Reports->Available update->update tab(right side) - Check the update available.
Step 3: Put the site on maintenance mode. For that please follow below steps:
Check on check-box[Put site into maintenance mode ] and then Save configuration. You will get below screen.
Step 4: Now to go update
Select all update on click on “Download these update” .You will see below screen.
Note :If you had made any changes in any module please keep its backup.
Click on continue. After clicking on continue you will see below screen.
Click on “Run database update”. After clicking you we see below screen.
Click on “Continue”. Clicking you will get below screen.
Click on “Apply pending Updates”. On clicking you will get below screen.
You have updated all the modules. Now to upload core drupal follow the following steps.
Login to filezilla locate your website folder.
Firstly Extract the file which you have downloaded in step 1.
Now go to root folder or your web-site. And copy all the file except
And paste all other files in root floder of your website.Please see below screen short.
Step 9: After file transferring go to update.php And click on continue .
Remove your site from maintenance mode.
Clear all caches and log-out from admin panel.