diff --git a/libs/aws/langchain_aws/retrievers/bedrock.py b/libs/aws/langchain_aws/retrievers/bedrock.py
index d0960002..55d32837 100644
--- a/libs/aws/langchain_aws/retrievers/bedrock.py
+++ b/libs/aws/langchain_aws/retrievers/bedrock.py
@@ -162,7 +162,9 @@ def _get_relevant_documents(
         response = self.client.retrieve(
             retrievalQuery={"text": query.strip()},
             knowledgeBaseId=self.knowledge_base_id,
-            retrievalConfiguration=self.retrieval_config.model_dump(exclude_none=True),
+            retrievalConfiguration=self.retrieval_config.model_dump(
+                exclude_none=True, by_alias=True
+            ),
         )
         results = response["retrievalResults"]
         documents = []
diff --git a/libs/aws/tests/unit_tests/retrievers/test_bedrock.py b/libs/aws/tests/unit_tests/retrievers/test_bedrock.py
index b243db10..6d5a84de 100644
--- a/libs/aws/tests/unit_tests/retrievers/test_bedrock.py
+++ b/libs/aws/tests/unit_tests/retrievers/test_bedrock.py
@@ -6,6 +6,11 @@
 from langchain_core.documents import Document
 
 from langchain_aws.retrievers import AmazonKnowledgeBasesRetriever
+from langchain_aws.retrievers.bedrock import (
+    RetrievalConfig,
+    SearchFilter,
+    VectorSearchConfig,
+)
 
 
 @pytest.fixture
@@ -15,7 +20,12 @@ def mock_client():
 
 @pytest.fixture
 def mock_retriever_config():
-    return {"vectorSearchConfiguration": {"numberOfResults": 4}}
+    return RetrievalConfig(
+        vectorSearchConfiguration=VectorSearchConfig(
+            numberOfResults=5,
+            filter=SearchFilter(in_={"key": "key", "value": ["value1", "value2"]}),
+        ),
+    )
 
 
 @pytest.fixture
@@ -43,6 +53,17 @@ def test_retriever_invoke(amazon_retriever, mock_client):
     }
     documents = amazon_retriever.invoke(query, run_manager=None)
 
+    mock_client.retrieve.assert_called_once_with(
+        retrievalQuery={"text": "test query"},
+        knowledgeBaseId="test_kb_id",
+        retrievalConfiguration={
+            "vectorSearchConfiguration": {
+                "numberOfResults": 5,
+                # Expecting to be called with correct "in" operatior instead of "in_"
+                "filter": {"in": {"key": "key", "value": ["value1", "value2"]}},
+            }
+        },
+    )
     assert len(documents) == 3
     assert isinstance(documents[0], Document)
     assert documents[0].page_content == "result1"