diff --git a/test-requirements.txt b/test-requirements.txt
index dd7bf51..3182472 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,6 @@
 
 hacking<0.11,>=0.10.2 # Apache-2.0
 
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 sphinx>=1.5.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0