diff --git a/requirements.txt b/requirements.txt
index a9e9258f01f2a42d3fc51909951bcb9304bb6719..71eba5d0fcc37c4bceaa124f02d6e95bcfcb255a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 setuptools
+scipy
 bob.extension
 bob.blitz
 bob.core