All websites that contains database-driven components (online shops, portals, forum communities) are safest when those builds and scripts are up to date. As the code distributors say, “upgrading is strongly recommended”. Once the build is finished and launched live this is the client's responsibility, either by maintenance agreement with us or by doing the work themselves. We all have multiple priorities competing for our attention, but please remember your website is a valuable business asset - don't make it easy for the hackers to ruin it!