pfSense 2.3.1 Update 5 (2.3.1_5) is a small bugfix release for the pfSense 2.3.1 major update announced last month, and since pfSense now lets its maintainers update only individual parts of the system, we see more and more small builds like this one, which patch the most annoying issues. pfSense 2.3.1 Update 5 will also update the PHP packages to version 5.6.22.