diff --git a/libs/kotaemon/pyproject.toml b/libs/kotaemon/pyproject.toml
index ac099a0..66e206d 100644
--- a/libs/kotaemon/pyproject.toml
+++ b/libs/kotaemon/pyproject.toml
@@ -30,7 +30,7 @@ dependencies = [
     "gradio==5.35.0",
     "fastapi<=0.120.0",
     "html2text==2024.2.26",
-    "langchain>=0.3,<0.4",
+    "langchain>=0.3,<1.2",
     "langchain-community>=0.2,<0.4",
     "langchain-openai>=0.2.0,<0.4.0",
     "langchain-google-genai>=2.0.0,<3.0.0",