diff --git a/requirements.txt b/requirements.txt
index a06e053b..d99157b4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 pbr>=2.0.0 # Apache-2.0
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 stevedore>=1.20.0 # Apache-2.0
 alembic>=0.8.10 # MIT