diff --git a/requirements.txt b/requirements.txt
index 5d108636..13b7b654 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ pip
 psutil
 scipy
 humanize
-# mpi4py
+mpi4py
 numpy-stl
 # pycuda
 # pyopencl