As you can see on the ImageJ News webpage, new versions appear quite regularly. For this book, we installed version 1.46r, but we wanted to catch up with version 1.47q. This latest ImageJ version has new functionalities and bug fixes that may be interesting for the user. Fortunately, ImageJ has an internal update command that will allow you to perform the update process easily, and without any user intervention. Simply run the Help | Update ImageJ... command and you will get the following dialog:

As you can see, it allows us to upgrade to the latest release and to other older versions, and bleeding-edge daily builds that are of no interest here. If you click on OK, your ImageJ installation will be upgraded and then automatically closed. The new version will be used the next time you run it.