OPNsense 21.7 "Noble Nightingale" has reached its end of life. As such it will not receive any more updates, but the upgrade to the new 22.1 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 breaking changes:

• This release contains a new major operating system version and should be carried out with the necessary care. Despite extended test coverage changes made by FreeBSD may still affect operation without our knowledge. Except for ZFS boot environments rollbacks between major operating system versions are extremely fragile and a reinstall of an older version should be attempted in the worst case.
• IPsec hash and cipher removals in FreeBSD 13 can affect existing setups as insecure cryptographic options have been removed upstream. If you are using MD5, Blowfish, DES, 3DES or CAST128 in your phase 2 please move to more secure settings prior to the upgrade.
• The Realtek vendor driver is no longer bundled with the updated FreeBSD kernel. If unsure whether FreeBSD 13 supports your Realtek NIC please install the os-realtek-re plugin prior to upgrading to retain operability of your NICs.

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.