Android:

•    Open the Play Store App (You must be signed in)
•    At the top right, tap your profile icon
•    Tap on Manage apps and device > Manage
•    Look for Monster Legends and click on it
•    If there is any update available for the game it will be shown here.
•    Click on 'Update' and it will start the installation process

iOS:

•    Open the App Store on your iOS device
•    Tap on your Account icon at the top right corner
•    Under ‘Available Updates’ look for Monster Legends and click on ‘Update’