diff --git a/test-requirements.txt b/test-requirements.txt
index a46c8a7c17..959323cf54 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,7 +6,7 @@ coverage>=4.0 # Apache-2.0
 doc8 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0 # BSD
-Babel>=2.3.4 # BSD
+Babel!=2.4.0,>=2.3.4 # BSD
 PyMySQL>=0.7.6 # MIT License
 iso8601>=0.1.11 # MIT
 oslotest>=1.10.0 # Apache-2.0