September 2026 Cumulative Updates for Dynamics 365 Business Central
September 2026 cumulative updates are available for Dynamics 365 Business Central across multiple release waves (28.5, 27.11, and 26.17). Online customers will be automatically upgraded to version 28.5 and should verify compatibility with customizations before applying updates.
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"Online customers will automatically be upgraded to version 28.5 over the coming days/weeks and should receive an email notification when upgraded."
Key points
- Three cumulative update versions released: 28.5 for 2026 Wave 1, 27.11 for 2025 Wave 2, and 26.17 for 2025 Wave 1
- Online customers automatically upgraded to version 28.5 with email notification
- Organizations should confirm implementation readiness and check compatibility with modifications before upgrading
- Work with Microsoft Partners to assess upgrade readiness and identify required preparation steps
Quotes
- “Online customers will automatically be upgraded to version 28.5 over the coming days/weeks and should receive an email notification when upgraded.” (Helps administrators know what to expect and when their online tenants will be updated)
- “Before applying the updates, you should confirm that your implementation is ready for the upgrade and ensure compatibility with your modifications.” (Critical for preventing issues during upgrade by validating customizations and dependencies in advance)
Context
- Features: Automatic online upgrades, Multiple version support
- Versions: 28.5, 27.11, 26.17
Source: DvlprLife, community blog. Summary, key points and quotes are derived (CONTENT-NOTICE.md); read the original for the full text.