diff --git a/setup.py b/setup.py
index d42f705..c9f7190 100644
--- a/setup.py
+++ b/setup.py
@@ -74,6 +74,9 @@
     ],
 
     keywords='cryto cryptography monocypher chacha blake2b 25519',
+    install_requires=[
+        'numpy>=2.1.0,<3',
+    ],
     ext_modules=extensions,
     python_requires='~=3.10',