diff --git a/global-requirements.txt b/global-requirements.txt
index 3c08c4e13..e79a6defc 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -40,7 +40,7 @@ jsonschema>=2.0.0,<3.0.0
 kazoo>=1.3.1
 keystonemiddleware>=1.0.0
 lesscpy>=0.9j
-pyscss>=1.2.0  # MIT License
+pyscss>=1.2.1,<1.3  # MIT License
 django-pyscss>=1.0.2  # BSD License (2 clause)
 kombu>=2.4.8
 libvirt-python>=1.2.5                   # LGPLv2+