Fix

Author: dandavison

temporalio/workflow.py

@@ -1512,6 +1512,13 @@ def _apply_to_class(
                         f"Multiple update methods found for {defn_name} "
                         f"(at least on {name} and {updates[update_defn.name].fn.__name__})"
                     )
+                elif update_defn.validator and not _parameters_identical_up_to_naming(
+                    update_defn.fn, update_defn.validator
+                ):
+                    issues.append(
+                        f"Update validator method {update_defn.validator.__name__} parameters "
+                        f"do not match update method {update_defn.fn.__name__} parameters"
+                    )
                 else:
                     updates[update_defn.name] = update_defn