diff --git a/libraries/botbuilder-core/botbuilder/core/turn_context.py b/libraries/botbuilder-core/botbuilder/core/turn_context.py
index a16eed975..5b3299d74 100644
--- a/libraries/botbuilder-core/botbuilder/core/turn_context.py
+++ b/libraries/botbuilder-core/botbuilder/core/turn_context.py
@@ -359,9 +359,11 @@ def remove_recipient_mention(activity: Activity) -> str:
     def remove_mention_text(activity: Activity, identifier: str) -> str:
         mentions = TurnContext.get_mentions(activity)
         for mention in mentions:
-            if mention.mentioned.id == identifier:
+            if mention.additional_properties["mentioned"]["id"] == identifier:
                 mention_name_match = re.match(
-                    r"<at(.*)>(.*?)<\/at>", mention.text, re.IGNORECASE
+                    r"<at(.*)>(.*?)<\/at>",
+                    mention.additional_properties["text"],
+                    re.IGNORECASE,
                 )
                 if mention_name_match:
                     activity.text = re.sub(
diff --git a/libraries/botbuilder-core/tests/test_inspection_middleware.py b/libraries/botbuilder-core/tests/test_inspection_middleware.py
index 30c8ce7bf..68259a1b4 100644
--- a/libraries/botbuilder-core/tests/test_inspection_middleware.py
+++ b/libraries/botbuilder-core/tests/test_inspection_middleware.py
@@ -14,7 +14,7 @@
 )
 from botbuilder.core.adapters import TestAdapter
 from botbuilder.core.inspection import InspectionMiddleware, InspectionState
-from botbuilder.schema import Activity, ActivityTypes, ChannelAccount, Mention
+from botbuilder.schema import Activity, ActivityTypes, ChannelAccount, Entity, Mention
 
 
 class TestConversationState(aiounittest.AsyncTestCase):
@@ -249,10 +249,12 @@ async def exec_test2(turn_context):
                 text=attach_command,
                 recipient=ChannelAccount(id=recipient_id),
                 entities=[
-                    Mention(
-                        type="mention",
-                        text=f"<at>{recipient_id}</at>",
-                        mentioned=ChannelAccount(name="Bot", id=recipient_id),
+                    Entity().deserialize(
+                        Mention(
+                            type="mention",
+                            text=f"<at>{recipient_id}</at>",
+                            mentioned=ChannelAccount(name="Bot", id=recipient_id),
+                        ).serialize()
                     )
                 ],
             )
diff --git a/libraries/botbuilder-core/tests/test_turn_context.py b/libraries/botbuilder-core/tests/test_turn_context.py
index 017b5383e..381287d3d 100644
--- a/libraries/botbuilder-core/tests/test_turn_context.py
+++ b/libraries/botbuilder-core/tests/test_turn_context.py
@@ -9,6 +9,7 @@
     ActivityTypes,
     ChannelAccount,
     ConversationAccount,
+    Entity,
     Mention,
     ResourceResponse,
 )
@@ -309,10 +310,12 @@ def test_should_remove_at_mention_from_activity(self):
             text="<at>TestOAuth619</at> test activity",
             recipient=ChannelAccount(id="TestOAuth619"),
             entities=[
-                Mention(
-                    type="mention",
-                    text="<at>TestOAuth619</at>",
-                    mentioned=ChannelAccount(name="Bot", id="TestOAuth619"),
+                Entity().deserialize(
+                    Mention(
+                        type="mention",
+                        text="<at>TestOAuth619</at>",
+                        mentioned=ChannelAccount(name="Bot", id="TestOAuth619"),
+                    ).serialize()
                 )
             ],
         )