diff --git a/requirements.txt b/requirements.txt
index a123e32..9ec0f55 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,6 +12,6 @@ oslo.utils>=3.20.0 # Apache-2.0
 PrettyTable<0.8,>=0.7.1 # BSD
 requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
 simplejson>=2.2.0 # MIT
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 six>=1.9.0 # MIT
 python-keystoneclient>=3.8.0 # Apache-2.0