diff --git a/line-openapi b/line-openapi
index 31fa3c73..2f380581 160000
--- a/line-openapi
+++ b/line-openapi
@@ -1 +1 @@
-Subproject commit 31fa3c7340c17a495906c96cca14ed38a93caafa
+Subproject commit 2f38058136b8f9237feafe34ea86a4be98455fb3
diff --git a/linebot/v3/webhooks/models/source.py b/linebot/v3/webhooks/models/source.py
index 30a878c0..f840986d 100644
--- a/linebot/v3/webhooks/models/source.py
+++ b/linebot/v3/webhooks/models/source.py
@@ -19,7 +19,7 @@
 import linebot.v3.webhooks.models
 
 
-from typing import Optional, Union
+from typing import Union
 from pydantic.v1 import BaseModel, Field, StrictStr
 
 class Source(BaseModel):
@@ -27,7 +27,7 @@ class Source(BaseModel):
     the source of the event.
     https://developers.line.biz/en/reference/messaging-api/#source-user
     """
-    type: Optional[StrictStr] = Field(None, description="source type")
+    type: StrictStr = Field(..., description="source type")
 
     __properties = ["type"]