diff --git a/requirements.txt b/requirements.txt
index 7cc99636..4824ea77 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ python-glanceclient>=2.5.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
 iso8601>=0.1.11 # MIT
 six>=1.9.0 # MIT
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 pyOpenSSL>=0.14 # Apache-2.0
 requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
 PyYAML>=3.10.0 # MIT