The Piip app is updated through the app stores, like any other app you may have installed.
Launch the Google Play app, tap the hamburger menu button (☰) on the top-left, select "My apps & games", and then look for the Piip app. Once opened tap "Update" and the latest version will be downloaded and installed.
Launch the iTunes Store, and tap the "Updates" tab on the bottom right section. Choose the Piip app and tap "Update".
We suggest you allow/activate/enable the auto-update feature of your app store as we are pushing updates often, solving on-going issues with this young app, adding more features and speeding things up.