diff --git a/requirements.txt b/requirements.txt
index 59b1755..505fbb5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,5 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-pbr>=1.6
\ No newline at end of file
+pbr>=1.6
+cliff>=1.4.5