diff --git a/requirements.txt b/requirements.txt
index 21db980..3301ca4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,5 @@
 # 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
 python-barbicanclient>=4.0.0 # Apache-2.0