diff --git a/app/rag_chain.py b/app/rag_chain.py
index 832cbb5..466c329 100644
--- a/app/rag_chain.py
+++ b/app/rag_chain.py
@@ -3,7 +3,7 @@ import os
 import weaviate
 from weaviate import Client
 from weaviate import WeaviateClient
-from weaviate.connect import ConnectionParams
+from weaviate.connect import ConnectionParams, AuthCredentials
 from weaviate.auth import AuthApiKey
 from weaviate.classes.init import Auth
 from langchain.vectorstores import Weaviate
@@ -107,33 +107,33 @@ def build_rag_chain():
     else:
         print("연결 실패 3. 서버 상태를 확인하세요.")
 
-    client4 = weaviate.Client(
-        url="http://183.111.96.67:32668",
-        auth_client_secret=auth
+
+    auth_key = AuthCredentials.api_key("01js3q6y7twaxccm5dbh3se9bt")  # 없으면 None
+
+    # 커넥션 설정 (http, grpc 둘 다)
+    connection_params = ConnectionParams.from_params(
+        http_host="183.111.96.67",
+        http_port=32668,
+        http_secure=False,
+        grpc_host="183.111.96.67",
+        grpc_port=32619,  # 예시 포트, 실제 grpc 포트 넣어야 함
+        grpc_secure=False,
+        auth_credentials=auth_key  # 없으면 생략 가능
     )
-  
+
+    client4 = WeaviateClient(connection_params=connection_params)
+
     if client4.is_ready():
         print("Weaviate 4 연결 성공!")
     else:
         print("연결 실패 4. 서버 상태를 확인하세요.")
 
-
-    
-
-    client5 = weaviate.Client(
-        url="s4x71b3lt32z3md1ya0yw.c0.asia-southeast1.gcp.weaviate.cloud",
-        auth_client_secret=AuthApiKey("0ojxypfXy2Y1rKw3KQdBUtwcWSrYPWitE7Qu") 
-    )
-  
-    if client5.is_ready():
-        print("Weaviate 5 연결 성공!")
-    else:
-        print("연결 실패 5. 서버 상태를 확인하세요.")
+    legacy_client = weaviate.Client(connection_params=client4.connection_params)  # langchain용
 
 
     # 2. 벡터스토어
     vectorstore = Weaviate(
-        client=client4,
+        client=legacy_client,
         index_name="LangDocs",
         text_key="text",
         embedding=OpenAIEmbeddings(openai_api_key=OPENAI_API_KEY)