diff --git a/backend/requirements.txt b/backend/requirements.txt
index d8d5ae2..dadad0a 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -8,12 +8,12 @@ python-multipart>=0.0.18
 email-validator>=2.2.0
 
 # LLM
-langchain>=0.3.14
-langchain-core>=0.3.31
-langgraph>=0.2.60
-langchain-anthropic>=0.3.4
-langchain-openai>=0.3.0
-langchain-ollama>=0.2.3
+langchain>=1.2.17
+langchain-core>=1.3.3
+langgraph>=1.1.10
+langchain-anthropic>=1.4.3
+langchain-openai>=1.2.1
+langchain-ollama>=1.1.0
 
 # Excel
 openpyxl>=3.1.5