We are regularly improving the system and publish new versions of the app. The app itself has an automated process to check if a new version is available to install. When this is the case, a popup window will appear and propose to update the app, which you can either install right away or postpone.
It is strongly recommended to accept all the updates that are proposed to you, so that you can benefit from the latest bug fixes, improvements and new features.
You can check which version of the app is currently installed on your mobile device as shown below.