Monzo advises customers to update operating systems for continued app support

Digital bank Monzo has cautioned customers that their accounts may be vulnerable to security risks if they fail to update their phone's operating system.

The bank has advised customers to upgrade to at least iOS 16 or Android 9 by 31 October 2025, as it will cease sending updates to its app on older systems, as reported by City AM.

Failure to do so will result in the app becoming unusable. This warning is a standard practice among banks and was only sent to a select group of customers.

In an email, Monzo stated: "We've noticed you've recently used Monzo from a version of iOS or Android that we'll stop supporting on 31 October 2025."

"This is because it's running on an older operating system (OS) that isn't getting the latest security updates and Monzo features."

"So both your device and Monzo account aren't as secure as they could be."

"We regularly stop Monzo from working with older operating systems."

The bank added: "If your device doesn't support a more recent OS, you'll need to use a newer device to keep using your Monzo account."

This warning comes on the heels of reports that Monzo is set to launch a secondary share sale, valuing the company at £4.5 billion, with hundreds of employees expected to sell tens of millions of pounds' worth of stock. The sale reportedly involved existing investors, including StepStone Group and Singapore's sovereign wealth fund GIC, who have agreed to purchase stock from employees.

A valuation of £4.5bn would represent an increase from the $5.2bn (£4.1bn) valuation Monzo achieved in a funding round in May, solidifying its position as one of the UK's largest tech start-ups.

Monzo, which has a workforce of approximately 4,000, has secured $610m (£490m) in funding this year alone.