diff --git a/pyproject.toml b/pyproject.toml
index 0ff92ccbd..aa25abaea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ exclude = [ "pandas-stubs/__init__.py" ]
 [tool.poetry.dependencies]
 python = ">=3.10"
 types-pytz = ">=2022.1.1"
-numpy = ">=1.23.5"
+numpy = ">=1.23.5, <= 2.3.5"
 
 [tool.poetry.group.dev.dependencies]
 mypy = ">=1.18.2"