diff --git a/setup.py b/setup.py
index 1b9c61f..6092c33 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ def get_long_description() -> str:
     license="LGPL-3.0",
     package_dir={"": "src"},
     packages=find_packages(where="src"),
-    install_requires=["dataclasses>=0.6;python_version<'3.7'", "numpy"],
+    install_requires=["dataclasses>=0.6;python_version<'3.7'", "numpy<2"],
     platforms="any",
     classifiers=[
         "Development Status :: 1 - Planning",