diff --git a/monasca_agent/collector/virt/vmware/inspector.py b/monasca_agent/collector/virt/vmware/inspector.py
index 85421ed3..4273cbda 100644
--- a/monasca_agent/collector/virt/vmware/inspector.py
+++ b/monasca_agent/collector/virt/vmware/inspector.py
@@ -28,9 +28,9 @@ opt_group = cfg.OptGroup(name='vmware',
                          title='Options for VMware')
 
 OPTS = [
-    cfg.StrOpt('host_ip',
-               default='',
-               help='IP address of the VMware Vsphere host.'),
+    cfg.HostAddressOpt('host_ip',
+                       default='0.0.0.0',
+                       help='IP address of the VMware Vsphere host.'),
     cfg.IntOpt('host_port',
                default=443,
                help='Port of the VMware Vsphere host.'),
diff --git a/requirements.txt b/requirements.txt
index ef182302..947db9d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@
 
 requests>=2.10.0,!=2.12.2,!=2.13.0  # Apache-2.0
 oslo.concurrency>=3.8.0 # Apache-2.0
-oslo.config>=3.14.0,!=3.18.0 # Apache-2.0
+oslo.config>=3.22.0 # Apache-2.0
 oslo.i18n>=2.1.0 # Apache-2.0
 oslo.utils>=3.18.0 # Apache-2.0
 oslo.vmware>=2.11.0 # Apache-2.0