diff --git a/requirements.txt b/requirements.txt
index 8f1f5837..9cd2467b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,12 +1,12 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-cliff!=1.16.0,!=1.17.0,>=1.15.0 # Apache-2.0
+cliff>=2.2.0 # Apache-2.0
 osc-lib>=1.0.2 # Apache-2.0
 oslo.utils>=3.16.0 # Apache-2.0
 pbr>=1.6 # Apache-2.0
 python-keystoneclient!=2.1.0,>=2.0.0 # Apache-2.0
-PyYAML>=3.1.0 # MIT
+PyYAML>=3.10.0 # MIT
 requests>=2.10.0 # Apache-2.0
 six>=1.9.0 # MIT
 stevedore>=1.16.0 # Apache-2.0