Im getting a new warning when building for iOS14 with the latest Xcode... xcdatamodel: warning: Misconfigured Property: Object.attribute is using a nil or insecure value transformer. Please switch to NSSecureUnarchiveFromDataTransformerName or a custom NSValueTransformer subclass of NSSecureUnarchiveFromDataTransformer This links to a CoreData parameter, which stores NSDictionary as a Transformable within CoreData. This has been the same for years with no warning, but all of a sudden it has been flagged up. The attribute configuration is... Type: Transformable (Optional) Transformer: Empty Custom Class: Empty Module: Empty It seems like I need to add something to the transformer field, but I cant find any reference to what I should be doing here on behalf of the NSDictionary. I have been looking around for some documentation for this, but nothing has come up so far. Anyone with any ideas?