Tesco is urging Clubcard app users to take action before Monday as the supermarket giant prepares to roll out an important update.
The change will affect millions of customers who use the digital version of their Clubcard when shopping.
After the deadline, older versions of the Tesco Shopping & Clubcard app will no longer function, potentially leaving shoppers unable to access their Clubcard benefits.
The update is being implemented to enhance data protection and online security for customers.
A general view of a Tesco Clubcard as Tesco has asked police to investigate claims that dozens of its customers' Clubcard accounts may have fallen victim to an online fraud
PA
Those who fail to update before the end of March will be unable to use their digital Clubcard when shopping in-store.
Tesco has sent a message to customers explaining the update: "To increase your data protection and online security, we're updating our Tesco app to a newer version."
The supermarket warns: "After March 31, older versions of the app will no longer work."
Many shoppers rely on the app instead of carrying physical Clubcards, which can save them significant amounts on their shopping.
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The Tesco Express on Bedford Street in Covent Garden
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The digital option has become increasingly popular as it eliminates the risk of forgetting a physical card and missing out on Clubcard prices.
Tesco reassures customers that they can continue "enjoying all of your Clubcard benefits" by simply updating to the latest version.
Updating the app is straightforward for all users regardless of their device type.
Android users, including those with Samsung phones, can update their app through the Google Play Store.
Man looking at his Tesco Clubcard points on a mobile phone
TescoiPhone users can access the update via the iOS App Store.
Tesco has confirmed that "this update won't affect anything you do on tesco.com."
The supermarket encourages customers to "update your Tesco app today" to ensure they can continue "managing your shop and Clubcard in one place."
With the March 31 deadline approaching, customers are advised to act promptly to maintain uninterrupted access to their Clubcard benefits.
