diff --git a/global-requirements.txt b/global-requirements.txt
index 020f2e16a3..14cb3becd2 100644
--- a/global-requirements.txt
+++ b/global-requirements.txt
@@ -69,7 +69,7 @@ keystonemiddleware>=4.0.0,!=4.1.0,!=4.5.0  # Apache-2.0
 krest>=1.3.1  # Apache-2.0
 packaging>=16.5  # Apache-2.0
 positional>=1.0.1 # Apache-2.0
-pyScss>=1.3.4  # MIT License
+pyScss>=1.3.4,!=1.3.5  # MIT License
 django-pyscss>=2.0.2  # BSD License (2 clause)
 kombu>=3.0.25  # BSD
 ldap3>=0.9.8.2  # LGPLv3
diff --git a/upper-constraints.txt b/upper-constraints.txt
index 9ef89c4aa8..0caccc8a59 100644
--- a/upper-constraints.txt
+++ b/upper-constraints.txt
@@ -233,7 +233,7 @@ psycopg2===2.6.1
 ptyprocess===0.5.1
 py===1.4.31
 pyOpenSSL===16.0.0
-pyScss===1.3.5
+pyScss===1.3.4
 pyasn1===0.1.9
 pyasn1-modules===0.0.8
 pycadf===2.3.0