diff --git a/requirements/edx-sandbox/base.txt b/requirements/edx-sandbox/base.txt
index d5f05083c8..f88cc899cf 100644
--- a/requirements/edx-sandbox/base.txt
+++ b/requirements/edx-sandbox/base.txt
@@ -1,3 +1,4 @@
 numpy==1.6.2
 networkx==1.7
-sympy==0.7.1
\ No newline at end of file
+sympy==0.7.1
+pyparsing==1.5.6
\ No newline at end of file