diff --git a/requirements.txt b/requirements.txt
index dcc4bb0..9b4fdbd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 Babel!=2.4.0,>=2.3.4 # BSD
-cliff>=2.8.0 # Apache-2.0
+cliff!=2.9.0,>=2.8.0 # Apache-2.0
 osc-lib>=1.7.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.28.0 # Apache-2.0