diff --git a/pyproject.toml b/pyproject.toml
index 242216fde..850422ecf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dev = [
 ]
 examples = [
   "pymilvus~=2.5",
-  "langchain~=0.3",
+  "langchain>=0.3,<2.0",
   "langchain-community~=0.3",
   "pypdf~=6.0",
   "wikipedia~=1.0",