diff --git a/requirements.txt b/requirements.txt
index 3bafd28..1336699 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 langchain==1.0.2
 langchain-openai==1.0.1
 langchain-mcp-adapters>=0.1.0
+langchain-deepseek>=0.1.20
 fastmcp==2.12.5
 fastapi>=0.120.0
 uvicorn[standard]>=0.27.0