diff --git a/glance/async_/flows/ovf_process.py b/glance/async_/flows/ovf_process.py
index d5dd291826..2f3ac158b9 100644
--- a/glance/async_/flows/ovf_process.py
+++ b/glance/async_/flows/ovf_process.py
@@ -19,10 +19,7 @@ import shutil
 import tarfile
 import urllib
 
-try:
-    from defusedxml import cElementTree as ET
-except ImportError:
-    from defusedxml import ElementTree as ET
+from defusedxml import ElementTree as etree
 
 from oslo_config import cfg
 from oslo_log import log as logging
@@ -194,7 +191,7 @@ class OVAImageExtractor(object):
 
         disk_filename, file_elements, file_ref = None, None, None
         properties = {}
-        for event, elem in ET.iterparse(ovf):
+        for event, elem in etree.iterparse(ovf):
             if event == 'end':
                 ns, tag = _get_namespace_and_tag(elem.tag)
                 if ns in CIM_NS and tag in self.interested_properties:
diff --git a/requirements.txt b/requirements.txt
index 98552adde4..717fbc8f83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 pbr>=3.1.1 # Apache-2.0
-defusedxml>=0.6.0 # PSF
+defusedxml>=0.7.1 # PSF
 
 # < 0.8.0/0.8 does not work, see https://bugs.launchpad.net/bugs/1153983
 SQLAlchemy>=1.3.14 # MIT