diff --git a/requirements.txt b/requirements.txt
index 2b1b0019e..9e219c20c 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
 ipaddress>=1.0.7;python_version<'3.3' # PSF
 passlib>=1.7.0 # BSD
 python-ironic-inspector-client>=1.5.0 # Apache-2.0