...Alternatively, composer require --dev ecoapm/libyear will add libyear as a local dev dependency for your current directory's app. Download libyear.phar from the latest release, and put it in the current directory, or somewhere in your $PATH to be able to reference it from anywhere. There are obviously more nuanced ways to calculate dependency freshness. The advantage of this approach is its simplicity. You will be able to explain this calculation to your colleagues in about 30s. If your system has two dependencies, the first one year old, the second three, then your system is four libyears out-of-date.