diff --git a/libs/core/pyproject.toml b/libs/core/pyproject.toml
index 17ffaa4ed8..429a3c14bf 100644
--- a/libs/core/pyproject.toml
+++ b/libs/core/pyproject.toml
@@ -80,6 +80,11 @@ select = [
 disallow_untyped_defs = "True"
 exclude = ["notebooks", "examples", "example_data", "langchain_core/pydantic"]
 
+[[tool.mypy.overrides]]
+# conditional dependencies introduced by langsmith-sdk
+module = ["numpy", "pytest"]
+ignore_missing_imports = true
+
 [tool.coverage.run]
 omit = ["tests/*"]