OPNsense 23.7 "Not Yet" has reached its end of life. As such it will not receive any more updates, but the upgrade to the new 23.7 series is seamless and can be performed right here from the web GUI.

Another method is to import and reinstall using a new installation image, which will retain your settings using "Import Configuration", then reformat the disk and apply a clean system using either "Install (UFS)" or "Install (ZFS)".

You can also upgrade via console / SSH by using option 12 from the menu by typing "%%UPGRADE_RELEASE%%" when prompted.

Make sure to read the migration notes and adjust for possible minor breaking changes.

Please backup your configuration, preview the new version via live image or in a virtual machine. Create snapshots. If all else fails, report back in the forums for assistance.