On an iPhone, iPad or iPod touch

1. Open the App Store app
2. Tap your profile icon at the top of the screen
3. Scroll to see if Longleaf Valley is listed as having pending updates
4. Tap Update next to Longleaf Valley

Alternatively,

1. Open the App Store app
2. Tap Search in the bottom menu
3. Search for 'Longleaf Valley'
4. Tap on 'Longleaf Valley'
5. If an update a blue button will show that says 'Update' - tap it

For more information, follow this guide from Apple Support.

On an Android Phone or Tablet

1. Open the Google Play Store app
2. At the top right, tap the profile icon
3. Tap Manage apps and device. Apps with an update available are labelled 'Update available'
4. Tap Update on 'Longleaf Valley'

For more information, follow this guide from Google Play Help.