diff --git a/lower-constraints.txt b/lower-constraints.txt
index 4593a754a1ebacdb2c92fb0938a36874aecae712..a1e990d173537e690e05bf8d358b607beb92f2f6 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -13,14 +13,14 @@ fixtures==3.0.0
 futurist==1.2.0
 gitdb==0.6.4
 GitPython==1.0.1
-greenlet==0.4.10
+greenlet==0.4.15
 iso8601==0.1.11
 Jinja2==2.10
 jsonschema==3.2.0
 keystoneauth1==3.4.0
 kombu==4.0.0
 linecache2==1.0.0
-MarkupSafe==1.0
+MarkupSafe==1.1.1
 mox3==0.20.0
 msgpack-python==0.4.0
 netaddr==0.7.18
@@ -49,7 +49,7 @@ python-dateutil==2.5.3
 python-mimeparse==1.6.0
 python-subunit==1.0.0
 pytz==2013.6
-PyYAML==3.12
+PyYAML==3.13
 repoze.lru==0.7
 requests==2.14.2
 requestsexceptions==1.2.0
diff --git a/oslo_versionedobjects/tests/test_objects.py b/oslo_versionedobjects/tests/test_objects.py
index 4aa42b378284d51ee7e16bffcf9859802af2a408..0b21f5048a2c503a56d49de615594dea84a5c28d 100644
--- a/oslo_versionedobjects/tests/test_objects.py
+++ b/oslo_versionedobjects/tests/test_objects.py
@@ -1923,7 +1923,7 @@ class TestObjectSerializer(_BaseTestCase):
             }
 
         @base.VersionedObjectRegistry.register  # noqa
-        class Parent(base.VersionedObject):
+        class Parent(base.VersionedObject):  # noqa
             VERSION = '1.1'
 
             fields = {