WhatsApp has started blocking some users from logging into their accounts if their phones are running outdated operating systems. The new restriction affects selected users on both Android and iOS devices.

Affected users see a message asking them to update their phone’s operating system before they can access WhatsApp again. The restriction is applied through a server-side update, so it doesn’t depend on the WhatsApp version installed on the device.

WhatsApp has not yet confirmed exactly which Android or iOS versions are affected by the new login block.

WhatsApp Blocks Logins on Some Devices Running Outdated Operating Systems
According to information reported by WABetaInfo, affected users see a new screen directing them to their device settings. They are asked to install the latest operating system update available for their phone.

The prompt also provides instructions for users who are unsure which operating system version their device is currently running. After installing the required update, users can return to WhatsApp and log into their accounts.

There is currently no option to skip or bypass the requirement. Users who do not install the update remain unable to access their WhatsApp accounts.

Why WhatsApp Is Introducing the Restriction

Keeping a phone’s operating system updated is important for security. Older software can contain vulnerabilities that attackers may exploit to install malicious software or gain access to information stored on a device.

WhatsApp uses end-to-end encryption to protect messages while they are being sent. However, the security of the device itself remains important. If a phone is compromised, attackers may potentially access information before it is protected by encryption or after it reaches the device.

The latest login restriction appears to be part of WhatsApp’s broader efforts to improve security and reduce risks linked to outdated or compromised devices.

WhatsApp Also Targets Unofficial Clients
WhatsApp has been taking additional steps to protect users from security threats. In Android beta version 2.26.35.1, the company reportedly began testing a warning for users who have unofficial WhatsApp Web clients connected to their accounts.

The move followed a case in Italy in which around 200 users were reportedly notified after their devices were compromised through a fake version of WhatsApp.

The company is also working on features designed to identify suspicious messages and warn users about potential scams. Another feature under development is restricted chats, which can keep selected conversations limited to a user’s primary device.

For now, users who receive the new operating system update prompt should follow the instructions and install the latest available software before trying to log into WhatsApp again.