diff --git a/setup.py b/setup.py
index a362f0d2..b92eda63 100644
--- a/setup.py
+++ b/setup.py
@@ -60,7 +60,8 @@
       install_requires=[
             'numpy>=1.16',
             'pyspline>=1.1',
-            'scipy>=1.2'
+            'scipy>=1.2',
+            'mpi4py>=3.0'
       ],
       extras_require = {
         'testing':  ["numpy-stl"]