Key facts
- Expiration date
- August 11, 2026
- Affected channels
- All Insider channels, including Experimental and Beta
- Renewed certificate builds
- 29634.1000, 26300.9032, 28120.2630, 26220.9022, 28020.2623
- Warning message
- "This build will expire soon"
- Fix method
- Settings > Windows Update
Background
Microsoft has issued a reminder to Windows Insiders that they must update their PCs to a recent build within the next week. The latest Windows Insider builds include a renewed flight certificate, which is important because the current flight certificate is set to expire on August 11, 2026.
Flight certificates are used to encourage people to keep devices up to date and on supported versions of Windows. Microsoft ships renewed certificates on a routine basis. In the past, renewal mainly affected those in the Canary Channel, but now these certificates apply across all Insider channels, including Experimental and Beta.
Current situation
A brief reminder about the flight certificate appears at the top of the change log for the most recent Insider build. It states that the current flight certificate expires on August 11, 2026, and urges users to update their device to a build containing the renewed certificate before that date.
Microsoft has shared a chart to help Insiders stay up to date. The builds listed include 29634.1000 (available July 27, 2026), 26300.9032 (available July 31, 2026), 28120.2630 (available July 31, 2026), 26220.9022 (available July 31, 2026), and 28020.2623 (available July 31, 2026). Once users perform this one-time larger update, their PC will go back to receiving regular updates.
| Build number | Available date |
|---|---|
| 29634.1000 | July 27, 2026 |
| 26300.9032 | July 31, 2026 |
| 28120.2630 | July 31, 2026 |
| 26220.9022 | July 31, 2026 |
| 28020.2623 | July 31, 2026 |
Impacts
If Windows Insiders do not update their PC to a build with a fresh flight certificate, they will start seeing a warning that says, "This build will expire soon" on their desktop. They will also stop receiving automatic background updates once the flight certificate expires.
Users can fix the issue by going to Settings > Windows Update and letting their PC install the latest build. Test builds of Windows 11 are designed to expire relatively quickly, so regular updates are necessary to ensure the system is running a supported version of Windows.
Future outlook
Scenario analysis: The possibilities below are not certain predictions.
If Insiders update before August 11, 2026, they will continue to receive regular updates without interruption. If they miss the deadline, they may experience the expiration warning and lose automatic updates, but they can still manually update via Windows Update.
Microsoft may continue to renew flight certificates periodically, and future renewals could affect all Insider channels. If users do not update regularly, they may face similar expiration issues in the future, but the exact timing of future renewals remains unclear.
Source: windowscentral.com
