diff --git a/libs/vertexai/langchain_google_vertexai/_base.py b/libs/vertexai/langchain_google_vertexai/_base.py
index fe1307ae..211185b4 100644
--- a/libs/vertexai/langchain_google_vertexai/_base.py
+++ b/libs/vertexai/langchain_google_vertexai/_base.py
@@ -248,6 +248,7 @@ def _init_vertexai(cls, values: Dict) -> None:
             credentials=values.get("credentials"),
             api_transport=values.get("api_transport"),
             api_endpoint=values.get("api_endpoint"),
+            request_metadata=values.get("request_metadata"),
         )
         return None