diff --git a/pyproject.toml b/pyproject.toml
index c96426aab0..6ee940d38c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dependencies = [
     "ipython>=9.0.0,<10",
     "isodate>=0.7.2,<0.8",
     "jedi>=0.19.0,<0.20",
-    "langchain>=0.3.11,<0.4",
+    "langchain>=1.2.11,<1.3",
     "langchain-experimental>=0.3.4,<0.4",
     "langchain-openai>=0.3.2,<0.4",
     "litellm==1.81.13",