diff --git a/backend/open_webui/retrieval/utils.py b/backend/open_webui/retrieval/utils.py
index 88fa51f2dd..bb2c3ef12f 100644
--- a/backend/open_webui/retrieval/utils.py
+++ b/backend/open_webui/retrieval/utils.py
@@ -12,7 +12,10 @@ import re
 
 from urllib.parse import quote
 from huggingface_hub import snapshot_download
-from langchain.retrievers import ContextualCompressionRetriever, EnsembleRetriever
+from langchain_classic.retrievers import (
+    ContextualCompressionRetriever,
+    EnsembleRetriever,
+)
 from langchain_community.retrievers import BM25Retriever
 from langchain_core.documents import Document
 
diff --git a/backend/open_webui/routers/retrieval.py b/backend/open_webui/routers/retrieval.py
index 2bc0b00649..8f0c76775a 100644
--- a/backend/open_webui/routers/retrieval.py
+++ b/backend/open_webui/routers/retrieval.py
@@ -28,8 +28,11 @@ from pydantic import BaseModel
 import tiktoken
 
 
-from langchain.text_splitter import RecursiveCharacterTextSplitter, TokenTextSplitter
-from langchain_text_splitters import MarkdownHeaderTextSplitter
+from langchain_text_splitters import (
+    RecursiveCharacterTextSplitter,
+    TokenTextSplitter,
+    MarkdownHeaderTextSplitter,
+)
 from langchain_core.documents import Document
 
 from open_webui.models.files import FileModel, FileUpdateForm, Files
diff --git a/backend/open_webui/socket/utils.py b/backend/open_webui/socket/utils.py
index ccbe333656..327348626a 100644
--- a/backend/open_webui/socket/utils.py
+++ b/backend/open_webui/socket/utils.py
@@ -191,7 +191,9 @@ class YdocManager:
     async def remove_user_from_all_documents(self, user_id: str):
         if self._redis:
             keys = []
-            async for key in self._redis.scan_iter(match=f"{self._redis_key_prefix}:*", count=100):
+            async for key in self._redis.scan_iter(
+                match=f"{self._redis_key_prefix}:*", count=100
+            ):
                 keys.append(key)
             for key in keys:
                 if key.endswith(":users"):
diff --git a/backend/open_webui/utils/oauth.py b/backend/open_webui/utils/oauth.py
index a29f94a7d5..10941d4753 100644
--- a/backend/open_webui/utils/oauth.py
+++ b/backend/open_webui/utils/oauth.py
@@ -1318,9 +1318,9 @@ class OAuthManager:
         client = self.get_client(provider)
         if client is None:
             raise HTTPException(404)
-        
+
         kwargs = {}
-        if (auth_manager_config.OAUTH_AUDIENCE):
+        if auth_manager_config.OAUTH_AUDIENCE:
             kwargs["audience"] = auth_manager_config.OAUTH_AUDIENCE
 
         return await client.authorize_redirect(request, redirect_uri, **kwargs)
diff --git a/backend/requirements.txt b/backend/requirements.txt
index c0bf3f957f..a82f7cfc53 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -45,8 +45,10 @@ anthropic
 google-genai==1.56.0
 google-generativeai==0.8.6
 
-langchain==0.3.27
-langchain-community==0.3.29
+langchain==1.2.0
+langchain-community==0.4.1
+langchain-classic==1.0.0
+langchain-text-splitters==1.1.0
 
 fake-useragent==2.2.0
 chromadb==1.3.7