It can be that the automatic updater of Droppy isn't working properly, this can be caused by:
admin/updates/directory does not have write permission.
- The CURL extension of PHP is not enabled on your server (See Droppy system page)
- Your PHP is not able to unzip the file from the
admin/updates/(Check if the PHP ZIP module is enabled/installed on your server)
You can also manually update Droppy, please visit this article for more information.