In this chapter, we covered the importance of staying up to date across your entire stack of dependencies from development tools such as Node and npm, to Angular. We looked at how you can use ng update and Angular Update Guide to make Angular updates as painless as possible. We also covered manual updates, performance testing, dealing with out-of-band security vulnerabilities and patches, including the necessity to keep your web server up to date. Maintaining a relatively up-to-date system has direct cost benefits. The smaller the delta, the less the effort to upkeep. However, as time goes on, the cost of upgrading a system raises exponentially. As non-direct benefits, we can list customer satisfaction generated from better performance, a metric that impacts companies like Amazon at the tune of millions of dollars per every 100 ms of latency. New features in tools also...