With the command line option -checkversion we can see if we have the latest PlantUML version. The command prints to the console our current PlantUML version and latest version that is available. Inside a PlantUML definition we can use the command checkversion and generate for example a PNG image with information about our PlantUML version and the latest version that can be downloaded.

First we use the command line option -checkversion for an out-of-date version: