diff --git a/pyproject.toml b/pyproject.toml
index 171b342..e10345e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,7 @@ dependencies = [
     "idna>=3.15",
     # langsmith 0.9+ switches to an httpx2 stack; the cap keeps that migration a
     # deliberate change rather than a silent one.
-    "langsmith>=0.8.18,<0.9",
+    "langsmith>=0.8.18,<0.13",
     "pillow>=12.3.0",
     "pydantic-settings>=2.14.2",
     "soupsieve>=2.8.4",