diff --git a/requirements.txt b/requirements.txt
index 1c675709..e6adf1ef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,6 +6,7 @@ pandas
 pydicom
 pynrrd
 scikit-image
+scikit-learn
 SimpleITK
 tqdm
 pyyaml