diff --git a/mongoengine_plus/models/helpers.py b/mongoengine_plus/models/helpers.py
index d947213..4925eab 100644
--- a/mongoengine_plus/models/helpers.py
+++ b/mongoengine_plus/models/helpers.py
@@ -45,6 +45,9 @@ def mongo_to_dict(obj, exclude_fields: list = None) -> dict:
     if exclude_fields is None:
         exclude_fields = []
 
+    # remove _cls from heritage embedded fields
+
+    exclude_fields.append('_cls')
     for field_name in obj._fields:
 
         if field_name in exclude_fields:
diff --git a/mongoengine_plus/version.py b/mongoengine_plus/version.py
index ffcc925..156d6f9 100644
--- a/mongoengine_plus/version.py
+++ b/mongoengine_plus/version.py
@@ -1 +1 @@
-__version__ = '0.0.3'
+__version__ = '0.0.4'
diff --git a/requirements-test.txt b/requirements-test.txt
index e41bcdb..995c245 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,4 +1,4 @@
-black==21.5b1
+black==22.3.0
 flake8==3.9.*
 isort==5.8.*
 mypy==0.812
diff --git a/tests/models/test_helpers.py b/tests/models/test_helpers.py
index 99c4823..b6a7b89 100644
--- a/tests/models/test_helpers.py
+++ b/tests/models/test_helpers.py
@@ -31,9 +31,14 @@ class EnumType(Enum):
 
 
 class Embedded(EmbeddedDocument):
+    meta = {'allow_inheritance': True}
     name = StringField()
 
 
+class HeritageEmbedded(Embedded):
+    lastname = StringField()
+
+
 class TestModel(Document):
     id = StringField(default=uuid_field('PK'), primary_key=True)
     str_field = StringField()
@@ -50,6 +55,7 @@ class TestModel(Document):
     enum_list_field = ListField(EnumField(EnumType), default=[EnumType.member])
     embedded_list_field = ListField(EmbeddedDocumentField(Embedded))
     embedded_field = EmbeddedDocumentField(Embedded)
+    heritage_field = EmbeddedDocumentField(HeritageEmbedded)
     lazzy_field = LazyReferenceField(Reference)
     lazzy_list_field = ListField(LazyReferenceField(Reference))
     generic_lazzy_field = GenericLazyReferenceField()
@@ -61,7 +67,10 @@ def test_mongo_to_dict():
     reference = Reference()
     reference.save()
     model = TestModel(
-        embedded_list_field=[Embedded(name='')], lazzy_list_field=[reference]
+        embedded_list_field=[Embedded(name='')],
+        lazzy_list_field=[reference],
+        embedded_field=Embedded(name='Peter'),
+        heritage_field=HeritageEmbedded(name='some', lastname='other'),
     )
     model.save()
     model_dict = mongo_to_dict(model, exclude_fields=['str_field'])
@@ -78,7 +87,11 @@ def test_mongo_to_dict():
     assert model_dict['list_field'] == ['42']
     assert model_dict['enum_list_field'] == ['name']
     assert model_dict['embedded_list_field'] == [{'name': ''}]
-    assert model_dict['embedded_field'] == {}
+    assert model_dict['embedded_field'] == {'name': 'Peter'}
     assert model_dict['lazzy_field_uri'] is None
     assert model_dict['generic_lazzy_field_uri'] is None
     assert model_dict['lazzy_list_field_uris'] == ["Reference object"]
+    assert model_dict['heritage_field'] == {
+        'name': 'some',
+        'lastname': 'other',
+    }