diff --git a/requirements/edx-sandbox/py35.txt b/requirements/edx-sandbox/py35.txt
index 55b0aa0080789c3371830ec395800abe68c0a0fa..b34247ead1c0223075e63ca7663fc1143abe2032 100644
--- a/requirements/edx-sandbox/py35.txt
+++ b/requirements/edx-sandbox/py35.txt
@@ -20,7 +20,7 @@ matplotlib==2.2.4         # via -c requirements/edx-sandbox/../constraints.txt,
 mpmath==1.1.0             # via sympy
 networkx==2.2             # via -r requirements/edx-sandbox/py35.in
 nltk==3.5                 # via -r requirements/edx-sandbox/shared.txt, chem
-numpy==1.16.5             # via -c requirements/edx-sandbox/../constraints.txt, -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc
+numpy==1.16.5             # via -c requirements/edx-sandbox/../constraints.txt, -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc, scipy
 openedx-calc==1.0.9       # via -r requirements/edx-sandbox/py35.in
 pycparser==2.20           # via -r requirements/edx-sandbox/shared.txt, cffi
 pyparsing==2.2.0          # via -r requirements/edx-sandbox/py35.in, chem, matplotlib, openedx-calc