diff --git a/setup.py b/setup.py
index 0aee01326ff07715b07f49a4735d3a32120bdb92..35a3926266c15c294c24f090dc9010e76aebf79a 100644
--- a/setup.py
+++ b/setup.py
@@ -7,6 +7,7 @@ setup(
         name            = 'chains_addiction',
         version         = '0.1',
         description     = 'Discrete time, finit state space, stationary Hidden Markov Model.',
+        install_requires = ['numpy>=15.0.0'],
         include_dirs    = get_numpy_include_dirs(),
         ext_modules     =   [
                                 Extension(