The Hilo App should update automatically if the automatic app update settings on your phone are switched on.
Android: You can enable automatic updates for all apps on your phone by following these steps:
Open the Google Play Store app.
In the top right corner, tap the profile icon.
Tap Settings > Network Preferences > Auto-update apps.
Select one of the following options:
Over any network to update apps using either Wi-Fi or mobile data.
Over Wi-Fi only to update apps only when connected to Wi-Fi.
For further details, refer to: How to update apps on Android - Google Play Help
iOS: You can enable automatic updates for your apps by following these steps:
Open Settings.
Go to iTunes & App Store.
Under the Automatic Downloads section, toggle on Updates to enable automatic app updates.