diff --git a/openapi_core/schema/schemas/models.py b/openapi_core/schema/schemas/models.py
index a4109c4d..534e1f94 100644
--- a/openapi_core/schema/schemas/models.py
+++ b/openapi_core/schema/schemas/models.py
@@ -67,8 +67,12 @@ def __init__(
 
         self._source = _source
 
+    # Overriding object.__dict__ is a VERY bad idea as it totally breaks any
+    # possibility of pickling this object.  Pickling marshalls via object.__dict__
+    # via default __getstate__ and __setstate__ methods.  This is now renamed to
+    # keep the functionality for the validators, but keep pickling operational.
     @property
-    def __dict__(self):
+    def __newdict__(self):
         return self._source or self.to_dict()
 
     def to_dict(self):
diff --git a/openapi_core/unmarshalling/schemas/factories.py b/openapi_core/unmarshalling/schemas/factories.py
index 0952d005..272f8319 100644
--- a/openapi_core/unmarshalling/schemas/factories.py
+++ b/openapi_core/unmarshalling/schemas/factories.py
@@ -86,7 +86,7 @@ def get_validator(self, schema):
         }
         if self.context is not None:
             kwargs[self.CONTEXT_VALIDATION[self.context]] = True
-        return OAS30Validator(schema.__dict__, **kwargs)
+        return OAS30Validator(schema.__newdict__, **kwargs)
 
     def _get_format_checker(self):
         fc = deepcopy(oas30_format_checker)