diff --git a/requirements.txt b/requirements.txt
index 43624ce..e3ee3f7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ numpy>=1.14.0,<2.0.0
 oauth2client<4.0.0
 pandas>=0.22.0,<1.0.0
 six>=1.11.0,<2.0.0
+scikit-learn>=0.18,<0.21
 tensorflow==1.13.1
 tensorflow-transform==0.13.0
 tensorflow-data-validation==0.13.1