Please also see How to check your ProtonMail app version on Android and Chromebook.
ProtonMail is continually improving our software. We release these improvements, which include new features and security patches, as updates, so it’s a good idea to always run the latest version of our app. This article shows you how to check which version of the ProtonMail app you are using on your iPhone or iPad.
1. Select Menu.
2. Select Settings.
3. Scroll to the bottom of the screen to see the App Version number.
If your screen’s size prevents you from seeing certain information (as in the screenshot above), simply turn your phone round to view the screen in horizontal mode.
How to manually update to the latest version
1. Open the App Store app
2. Tap your profile icon at the top of the screen.
3. Scroll to see pending updates. Tap Update next to an app to update only that app, or tap Update All at the top of the list to update all apps.