At the time of writing the latest current stable pfSense CE firmware version is 2.7.2 but sometimes it is stuck at 2.7.0 and doesnt offer the update, web or CLI.
Perform a config backup (just in case) via the web interface
SSH to the IP and use the CLI menu
Attempt option 13) Update from Console , which will probably fail with a message similar to: ERROR: It was not possible to determine pfSense-upgrade remote version
Back in console menu, select option 8) Shell and enter the following commands:
pkg-static upgrade (may fail with error, if you receive an error with something like a kernel mismatch version run this command pkg-static upgrade -f and select Yes when asked to ignore
pkg-static set -v 0 pfSense-rc (this unsets the 'vital' flag on core files to allow upgrade)
pkg-static upgrade
Reboot, log in to the web interface and you should be on 2.7.2 firmware.