diff --git a/test-requirements.txt b/test-requirements.txt
index dc67dc36..3e81a129 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,7 +4,7 @@
 # Hacking already pins down pep8, pyflakes and flake8
 bandit>=1.1.0 # Apache-2.0
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 coverage>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 httplib2>=0.7.5 # MIT