Is it possible to update a Keychain item's kSecAttrAccessible value?

Question

Is it possible to update the value of the attribute kSecAttrAccessible of existing items in the Keychain? It seems that it cannot be changed after the item was

Answer 1

I was unable to get the other answer to work. I ended up testing kSecAttrAccessibile and if it wasn't what I wanted I recorded the value and attributes in the keychain in local variables, reset the keychain, set kSecAttrAccessible as desired and then set the value and attributes in the keychain to their original settings.