diff --git a/requirements.txt b/requirements.txt
index 349d731109..ee25e7e793 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -38,7 +38,7 @@ six>=1.10.0 # MIT
 oslo.db>=4.27.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
-oslo.messaging>=5.29.0 # Apache-2.0
+oslo.messaging>=5.29.0,!=9.0.0 # Apache-2.0
 oslo.middleware>=3.31.0 # Apache-2.0
 oslo.policy>=1.30.0 # Apache-2.0