diff --git a/requirements.txt b/requirements.txt
index d4073f98022ae3c0d249fe10c5072dca5c20739d..f20318aa9fa1581b35feb4fb9c07a7bd025bc6af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,5 @@ bob.io.image
 bob.measure
 numpy
 click >= 7
-scipy
\ No newline at end of file
+scipy
+scikit-learn
\ No newline at end of file