diff --git a/setup.py b/setup.py
index a3a455b..1fa16b6 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
 
     install_requires=[
             'pandas',
-            'numpy',
+            'numpy<2',
             'python-ternary',
             'matplotlib',
             'scikit-learn>=1.3',