diff --git a/src/langchain_google_cloud_sql_pg/async_vectorstore.py b/src/langchain_google_cloud_sql_pg/async_vectorstore.py
index 2e04bb93..0aa4bc07 100644
--- a/src/langchain_google_cloud_sql_pg/async_vectorstore.py
+++ b/src/langchain_google_cloud_sql_pg/async_vectorstore.py
@@ -327,7 +327,7 @@ async def aget_by_ids(self, ids: Sequence[str]) -> list[Document]:
                     Document(
                         page_content=row[self.content_column],
                         metadata=metadata,
-                        id=row[self.id_column],
+                        id=str(row[self.id_column]),
                     )
                 )
             )
@@ -651,7 +651,7 @@ async def asimilarity_search_with_score_by_vector(
                     Document(
                         page_content=row[self.content_column],
                         metadata=metadata,
-                        id=row[self.id_column],
+                        id=str(row[self.id_column]),
                     ),
                     row["distance"],
                 )
@@ -742,7 +742,7 @@ async def amax_marginal_relevance_search_with_score_by_vector(
                     Document(
                         page_content=row[self.content_column],
                         metadata=metadata,
-                        id=row[self.id_column],
+                        id=str(row[self.id_column]),
                     ),
                     row["distance"],
                 )