diff --git a/pyproject.toml b/pyproject.toml
index a5efc7d..df7f2cb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ classifiers = [
 
 [project.optional-dependencies]
 server = ["fastapi>=0.105.0,<1.0.0", "uvicorn>=0.20.0,<1.0.0"]
-langchain = ["langchain>=0.1.0,<0.2.0"]
+langchain = ["langchain>=0.2.6,<0.3.0"]
 qdrant = ["qdrant-client>=1.9.0,<2.0.0"]
 chromadb = ["chromadb>=0.5.0,<1.0.0"]
 sentence-transformers = ["sentence-transformers>=2.3.0,<3.0.0"]