Updated from global requirements

Change-Id: I3e2486840186c4a02c21926a721fab2912ae39f4

Author: OpenStack Proposal Bot

requirements.txt

@@ -9,6 +9,6 @@ oslo.serialization>=1.4.0 # Apache-2.0
 oslo.utils!=2.6.0,>=2.0.0 # Apache-2.0
 PrettyTable<0.8,>=0.7
 python-keystoneclient!=1.8.0,>=1.6.0
-requests!=2.8.0,>=2.5.2
+requests!=2.8.0,!=2.9.0,>=2.5.2
 six>=1.9.0
 stevedore>=1.5.0 # Apache-2.0