diff --git a/rasa_sdk/grpc_server.py b/rasa_sdk/grpc_server.py
index 187aa609..3b7f8d3e 100644
--- a/rasa_sdk/grpc_server.py
+++ b/rasa_sdk/grpc_server.py
@@ -113,7 +113,7 @@ async def Actions(self, request: ActionsRequest, context) -> ActionsResponse:
     async def Webhook(
         self,
         request: WebhookRequest,
-        context,
+        context: grpc.aio.ServicerContext,
     ) -> action_webhook_pb2.WebhookResponse:
         """Handle RPC request for the webhook.