diff --git a/requirements.txt b/requirements.txt
index 3d5fa7ae..eae27fdf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,5 +5,6 @@ Cython>0.18
 mpi4py
 numpy>=1.17
 scipy>=0.10
+scikit-image
 skyfield
 pywavelets
\ No newline at end of file