Microsoft Schedules Author-Signing Certificate Update for September 2026
Microsoft will rotate its author-signing certificates on September 23, 2026, requiring developers and administrators to update their build pipelines and trust stores to ensure continued software compatibility.
Microsoft scheduled an author-signing certificate update for September 23, 2026. This change alters how the company signs software and associated files, requiring developers and system administrators to prepare their environments.
Detailed in official documentation from the .NET team, the rotation acts as a standard maintenance procedure for digital security infrastructure. Microsoft rotates these credentials to adhere to modern security standards and ensure the continued integrity of distributed software packages as older certificates expire or require renewal.
If you work with VB.NET and other tools, monitor your build pipelines and security configurations for dependencies on specific signing certificates. Those managing automated deployment systems or locked-down environments may need to update their trust stores or certificate validation logic to accommodate the new signing authority before the cutoff date.
Administrators should review internal security policies regarding trusted publishers. Ensuring local environments recognize the new signing certificate prevents deployment errors and security warnings when updated software distributes after September 23, 2026. Check your pipelines now.