diff --git a/requirements.txt b/requirements.txt
index 21cbaf3f..8bb43160 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ pbr>=1.6 # Apache-2.0
 anyjson>=0.3.3 # BSD
 eventlet!=0.18.3,>=0.18.2 # MIT
 GitPython>=1.0.1 # BSD License (3 clause)
-kombu>=3.0.25 # BSD
+kombu!=4.0.0,>=3.0.25 # BSD
 oslo.config>=3.7.0 # Apache-2.0
 oslo.log>=1.14.0 # Apache-2.0
 oslo.service>=1.0.0 # Apache-2.0