diff --git a/requirements.txt b/requirements.txt
index 76df7f4172..ef708a4bd1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # 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
 croniter>=0.3.4 # MIT License
 cryptography>=1.6 # BSD/Apache-2.0
 debtcollector>=1.2.0 # Apache-2.0