diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 5abf9f7..935f862 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -16,7 +16,7 @@ dependencies = [
     "fastapi==0.115.5",
     "httptools==0.6.4",
     "httpx==0.27.2",
-    "langchain==0.3.9",
+    "langchain==0.3.13",
     "langchain-openai==0.2.11",
     "langgraph==0.2.60",
     "loguru==0.7.2",