diff --git a/requirements.txt b/requirements.txt
index cd729ee50..23954c9d2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,6 +12,7 @@ keystonemiddleware>=2.0.0
 lxml>=2.3
 Routes!=2.0,!=2.1,>=1.12.3;python_version=='2.7'
 Routes!=2.0,>=1.12.3;python_version!='2.7'
+cryptography>=0.9.1 # Apache-2.0
 WebOb>=1.2.3
 greenlet>=0.3.2
 PasteDeploy>=1.5.0
@@ -21,7 +22,6 @@ sqlalchemy-migrate>=0.9.6
 netaddr>=0.7.12
 netifaces>=0.10.4
 paramiko>=1.13.0
-pyasn1
 Babel>=1.3
 iso8601>=0.1.9
 jsonschema!=2.5.0,<3.0.0,>=2.0.0