If you’re a member of Microsoft’s Windows Insider Preview program and signed up to receive a new preview build in the Canary and Dev channels, you might want to update them now if you haven’t done so in the past few weeks.

In mid-August, Microsoft released the Canary Channel build 25931 And the Dev channel build 23526 For people who signed up to receive updates on those Windows Insider channels. In the blog posts for these updates, there were these specific messages:

Insider Preview Build has expired: The expiration date of the Insider Preview version uploaded to the Canary Channel has been updated to 9/15/2024 as of Build 25931. Please make sure you are updated to the latest version on the Canary Channel.

Insider Preview Build has expired: The expiration date of the Insider Preview version uploaded to the Dev Channel has been updated to 9/15/2024 as of Build 23526. Please make sure you are updated to the latest version on the Dev Channel.

Basically, this means that if you have a Canary build older than 25931 or a Dev build older than 23526 installed on your machine, those builds will expire today, September 15, 2023. You need to update those builds to the newest versions, Or at least with the version mentioned in those blog posts.

Running an expired preview build of Windows 11 will cause the OS to pester you with full-screen banners, as shown By X (formerly Twitter) user XenoPanther below. Also, Microsoft is now servicing old Windows Insider builds, which means you don’t get critical security patches and important fixes.

You can get more information on how to update From an expired build on this Microsoft support post.

Microsoft is expected to release its next major Windows 11 update, 23H2, within days or weeks. The company may be able to start rolling it out, or announce its release date, next week during its Surface unveiling event.

If you’re a member of the Windows Insider program, you likely know about a number of the new features coming to 23H2, including Windows Copilot, the revamped File Explorer, and much more. You can check out our Windows 11 23H2 preview for more information.