diff --git a/libraries/botbuilder-core/botbuilder/core/teams/teams_helper.py b/libraries/botbuilder-core/botbuilder/core/teams/teams_helper.py
index f9d294c39..766cd6291 100644
--- a/libraries/botbuilder-core/botbuilder/core/teams/teams_helper.py
+++ b/libraries/botbuilder-core/botbuilder/core/teams/teams_helper.py
@@ -10,23 +10,21 @@
 import botbuilder.schema as schema
 import botbuilder.schema.teams as teams_schema
 
-# Optimization: The dependencies dictionary could be cached here,
-# and shared between the two methods.
+DEPENDICIES = [
+    schema_cls
+    for key, schema_cls in getmembers(schema)
+    if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
+]
+DEPENDICIES += [
+    schema_cls
+    for key, schema_cls in getmembers(teams_schema)
+    if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
+]
+DEPENDICIES_DICT = {dependency.__name__: dependency for dependency in DEPENDICIES}
 
 
 def deserializer_helper(msrest_cls: Type[Model], dict_to_deserialize: dict) -> Model:
-    dependencies = [
-        schema_cls
-        for key, schema_cls in getmembers(schema)
-        if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
-    ]
-    dependencies += [
-        schema_cls
-        for key, schema_cls in getmembers(teams_schema)
-        if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
-    ]
-    dependencies_dict = {dependency.__name__: dependency for dependency in dependencies}
-    deserializer = Deserializer(dependencies_dict)
+    deserializer = Deserializer(DEPENDICIES_DICT)
     return deserializer(msrest_cls.__name__, dict_to_deserialize)
 
 
@@ -34,17 +32,6 @@ def serializer_helper(object_to_serialize: Model) -> dict:
     if object_to_serialize is None:
         return None
 
-    dependencies = [
-        schema_cls
-        for key, schema_cls in getmembers(schema)
-        if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
-    ]
-    dependencies += [
-        schema_cls
-        for key, schema_cls in getmembers(teams_schema)
-        if isinstance(schema_cls, type) and issubclass(schema_cls, (Model, Enum))
-    ]
-    dependencies_dict = {dependency.__name__: dependency for dependency in dependencies}
-    serializer = Serializer(dependencies_dict)
+    serializer = Serializer(DEPENDICIES_DICT)
     # pylint: disable=protected-access
     return serializer._serialize(object_to_serialize)