diff --git a/src/langchain_google_alloydb_pg/async_vectorstore.py b/src/langchain_google_alloydb_pg/async_vectorstore.py
index 28e62ba3..e7b98cbc 100644
--- a/src/langchain_google_alloydb_pg/async_vectorstore.py
+++ b/src/langchain_google_alloydb_pg/async_vectorstore.py
@@ -19,7 +19,7 @@
 import json
 import re
 import uuid
-from typing import Any, Callable, Iterable, List, Optional, Sequence
+from typing import Any, Callable, Iterable, Optional, Sequence
 
 import numpy as np
 import requests
@@ -720,7 +720,7 @@ 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"],
                 )
@@ -811,7 +811,7 @@ 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"],
                 )
@@ -903,7 +903,7 @@ async def is_valid_index(
             results = result_map.fetchall()
         return bool(len(results) == 1)
 
-    async def aget_by_ids(self, ids: Sequence[str]) -> List[Document]:
+    async def aget_by_ids(self, ids: Sequence[str]) -> list[Document]:
         """Get documents by ids."""
 
         quoted_ids = [f"'{id_val}'" for id_val in ids]
@@ -918,7 +918,7 @@ async def aget_by_ids(self, ids: Sequence[str]) -> List[Document]:
 
         column_names = ", ".join(f'"{col}"' for col in columns)
 
-        query = f'SELECT {column_names} FROM "{self.schema_name}"."{self.table_name}" WHERE {self.id_column} IN ({id_list_str});'
+        query = f'SELECT {column_names} FROM "{self.schema_name}"."{self.table_name}" WHERE "{self.id_column}" IN ({id_list_str});'
 
         async with self.engine.connect() as conn:
             result = await conn.execute(text(query))
@@ -939,14 +939,14 @@ 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]),
                     )
                 )
             )
 
         return documents
 
-    def get_by_ids(self, ids: Sequence[str]) -> List[Document]:
+    def get_by_ids(self, ids: Sequence[str]) -> list[Document]:
         raise NotImplementedError(
             "Sync methods are not implemented for AsyncAlloyDBVectorStore. Use AlloyDBVectorStore interface instead."
         )
diff --git a/src/langchain_google_alloydb_pg/vectorstore.py b/src/langchain_google_alloydb_pg/vectorstore.py
index 51e34dc3..f9422fab 100644
--- a/src/langchain_google_alloydb_pg/vectorstore.py
+++ b/src/langchain_google_alloydb_pg/vectorstore.py
@@ -15,7 +15,7 @@
 # TODO: Remove below import when minimum supported Python version is 3.10
 from __future__ import annotations
 
-from typing import Any, Callable, Iterable, List, Optional, Sequence
+from typing import Any, Callable, Iterable, Optional, Sequence
 
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
@@ -906,11 +906,11 @@ def is_valid_index(
         """Check if index exists in the table."""
         return self._engine._run_as_sync(self.__vs.is_valid_index(index_name))
 
-    async def aget_by_ids(self, ids: Sequence[str]) -> List[Document]:
+    async def aget_by_ids(self, ids: Sequence[str]) -> list[Document]:
         """Get documents by ids."""
         return await self._engine._run_as_async(self.__vs.aget_by_ids(ids=ids))
 
-    def get_by_ids(self, ids: Sequence[str]) -> List[Document]:
+    def get_by_ids(self, ids: Sequence[str]) -> list[Document]:
         """Get documents by ids."""
         return self._engine._run_as_sync(self.__vs.aget_by_ids(ids=ids))
 
diff --git a/tests/test_async_vectorstore_search.py b/tests/test_async_vectorstore_search.py
index ce0e0561..f43f7fc2 100644
--- a/tests/test_async_vectorstore_search.py
+++ b/tests/test_async_vectorstore_search.py
@@ -34,6 +34,7 @@
 CUSTOM_TABLE = "test_table_custom" + str(uuid.uuid4()).replace("-", "_")
 IMAGE_TABLE = "test_image_table" + str(uuid.uuid4()).replace("-", "_")
 VECTOR_SIZE = 768
+sync_method_exception_str = "Sync methods are not implemented for AsyncAlloyDBVectorStore. Use AlloyDBVectorStore interface instead."
 
 embeddings_service = DeterministicFakeEmbedding(size=VECTOR_SIZE)
 
@@ -374,3 +375,8 @@ async def test_aget_by_ids_custom_vs(self, vs_custom):
         results = await vs_custom.aget_by_ids(ids=test_ids)
 
         assert results[0] == Document(page_content="foo", id=ids[0])
+
+    def test_get_by_ids(self, vs):
+        test_ids = [ids[0]]
+        with pytest.raises(Exception, match=sync_method_exception_str):
+            vs.get_by_ids(ids=test_ids)