diff --git a/pyproject.toml b/pyproject.toml
index 7598cf5..3df1da7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-langchain = ["langchain-core>=0.3,<1"]
+langchain = ["langchain-core>=0.3,<2"]
 dev = [
     "pytest>=8",
     "pytest-asyncio>=0.25",