Updated from global requirements

Change-Id: I4be717979bd4371bc544312d556934aef4f3a629

Author: OpenStack Proposal Bot

requirements.txt

@@ -9,7 +9,7 @@ cliff>=1.7.0  # Apache-2.0
 cliff-tablib>=1.0
 oslo.i18n>=1.0.0  # Apache-2.0
 oslo.utils>=1.2.0                       # Apache-2.0
-oslo.serialization>=1.0.0               # Apache-2.0
+oslo.serialization>=1.2.0               # Apache-2.0
 python-glanceclient>=0.15.0
 python-keystoneclient>=0.11.1
 python-novaclient>=2.18.0