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            Spring ’26 (API Version 66.0)

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            Spring ’26 (API Version 66.0)

            These updates affect only flows that are configured to run on API version 66.0 and later.

            Required Editions

            View supported editions.

            Require Visible No-Argument Constructors for Apex Classes

            Custom Apex classes used as invocable action parameters now require an accessible no-argument constructor. These classes typically contain properties annotated with @InvocableVariable. This requirement applies when flows, REST API, or Apex code call invocable actions.

            If your custom Apex class defines other constructors, add an explicit no-argument constructor. Use a public access modifier for classes in your org or within the same package. Use a global access modifier for classes in managed packages to make them accessible from subscriber orgs.

            If a flow references an Apex invocable action with a parameter defined in an Apex class, the system checks for an accessible no-argument constructor. If the Apex class lacks an accessible no-argument constructor, Flow Builder shows an error when you configure that action's inputs.

            Record-Triggered Flows Issue with Non-Insertable Fields Was Fixed

            Record-triggered flows that run before records are saved now respect the internal writeable status of non-insertable fields. If existing flows try to update fields that aren’t editable, this error message appears: Invalid target field for field update.

             
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