diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index 3edce34f547840c61ca5d748dcc807e4bdfecbad..8d609e05f192124d50730e8c573dd9821561c778 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -41,6 +41,7 @@ pycrypto>=2.6
 pygments==1.5
 pygraphviz==1.1
 pymongo==2.4.1
+pyparsing==1.5.6
 python-memcached==1.48
 python-openid==2.2.5
 pytz==2012h