diff --git a/pyproject.toml b/pyproject.toml
index 1cc9fbe..33cff97 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ dependencies = [
   "fastapi>= 0.86.0, <= 0.109.0",
   "Flask>= 2.3.2, <= 3.0.1",
   "fsspec>= 2023.1.0, <= 2023.12.2",
-  "langchain>= 0.0.179, <= 0.1.1",
+  "langchain>= 0.0.179, <= 0.3.26",
   "numpy>= 1.23.2, <= 1.26.3",
   "openai>= 0.27, <= 1.9.0",
   "openpyxl>=3.1.1, <= 3.1.2",