diff --git a/pyproject.toml b/pyproject.toml
index a393b76..1813b02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,7 +31,7 @@ dependencies = [
 ]
 
 [project.optional-dependencies]
-langchain = ["langchain-core>=0.3"]
+langchain = ["langchain-core>=1.2.28"]
 all = ["toolglot[langchain]"]
 dev = [
     "pytest>=8.0",