Yes. Download the ISO. Burn it to disk or use Unetbootin (in the
repositories) or Startup Disk Creator to make a bootable USB stick. Then
when you reboot into the installer it will now check if you have the
previous version installed and offer to upgrade. I always do a clean
installation so have not used this myself. Always back up your data before
you upgrade. If you have a wireless connection then use Ethernet while you
upgrade and you can get updated packages while it installs. Getting it
wirelessly is iffy due to driver issues.