diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index cc9a87ee6f..ca405c05c5 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -69,6 +69,7 @@ Shapely==1.2.16
 singledispatch==3.4.0.2
 sorl-thumbnail==11.12
 South==0.7.6
+sure==1.2.3
 sympy==0.7.1
 xmltodict==0.4.1
 django-ratelimit-backend==0.6