diff --git a/requirements.txt b/requirements.txt
index d603924df..a104de934 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ oslo.config>=1.6.0                      # Apache-2.0
 oslo.context>=0.1.0                     # Apache-2.0
 oslo.db>=1.4.1                          # Apache-2.0
 oslo.i18n>=1.3.0                        # Apache-2.0
-oslo.messaging>=1.4.0,!=1.5.0
+oslo.messaging>=1.4.0,!=1.5.0,<1.6.0
 oslo.middleware>=0.3.0                  # Apache-2.0
 oslo.serialization>=1.2.0               # Apache-2.0
 oslo.utils>=1.2.0                       # Apache-2.0