Autodesk Platform Services is preparing to update the Revit Automation engine to Revit 2026.5 on September 21, 2026. This update will also move the engine runtime to .NET 10.
We are sharing this notice in advance so Revit Automation customers have time to validate their applications before the production update.
What is changing?
The Revit Automation engine for Revit 2026 will be upgraded to Revit 2026.5. As part of this Revit update, the Automation environment will also move to .NET 10.
For security reasons, we do not plan to keep the Revit 2026 Automation engine on an earlier Revit or .NET version after the migration.
Do I need to update my AppBundle?
For most applications, no changes are expected to be required. Existing Revit Automation AppBundles are generally expected to continue working with Revit 2026.5 and .NET 10.
However, because this update changes the underlying Revit and .NET runtime, we recommend that developers perform a quick compatibility check before the production migration, particularly for AppBundles that depend on runtime-specific behavior or third-party .NET libraries.
Recommended validation
Before September 21, we recommend testing your application against Revit Desktop 2026.5.
You can use the Revit Automation local debugging workflow to run your AppBundle locally with Revit 2026.5 and verify that your automation completes successfully.
We suggest checking:
-
Your AppBundle loads successfully with Revit 2026.5.
-
Revit API calls used by your application behave as expected.
-
Third-party and application dependencies are compatible with .NET 10.
-
Your normal automation workflows complete without unexpected errors.
If your existing AppBundle works correctly with Revit 2026.5, no further action should normally be necessary.
If you encounter a compatibility issue, rebuild or update the affected application and AppBundle for the Revit 2026.5 / .NET 10 environment before resubmitting it to Revit Automation.
Migration schedule
The production Revit Automation engine will be updated to Revit 2026.5 and .NET 10 on September 21, 2026.
We encourage Revit Automation customers to complete any desired validation before that date.
If you have any further questions, please contact APS support.