diff --git a/oslo_versionedobjects/base.py b/oslo_versionedobjects/base.py
index 72db11b..7df5e52 100644
--- a/oslo_versionedobjects/base.py
+++ b/oslo_versionedobjects/base.py
@@ -56,7 +56,7 @@ def _make_class_properties(cls):
         for name, field in supercls.fields.items():
             if name not in cls.fields:
                 cls.fields[name] = field
-    for name, field in six.iteritems(cls.fields):
+    for name, field in cls.fields.items():
         if not isinstance(field, obj_fields.Field):
             raise exception.ObjectFieldInvalid(
                 field=name, objname=cls.obj_name())
@@ -208,7 +208,7 @@ def remotable(fn):
         if self.indirection_api:
             updates, result = self.indirection_api.object_action(
                 ctxt, self, fn.__name__, args, kwargs)
-            for key, value in six.iteritems(updates):
+            for key, value in updates.items():
                 if key in self.fields:
                     field = self.fields[key]
                     # NOTE(ndipanov): Since VersionedObjectSerializer will have
@@ -933,7 +933,7 @@ class VersionedObjectSerializer(messaging.NoOpSerializer):
         iterable = values.__class__
         if issubclass(iterable, dict):
             return iterable([(k, action_fn(context, v))
-                             for k, v in six.iteritems(values)])
+                             for k, v in values.items()])
         else:
             # NOTE(danms, gibi) A set can't have an unhashable value inside,
             # such as a dict. Convert the set to list, which is fine, since we
diff --git a/oslo_versionedobjects/fields.py b/oslo_versionedobjects/fields.py
index f977bd9..21e38ec 100644
--- a/oslo_versionedobjects/fields.py
+++ b/oslo_versionedobjects/fields.py
@@ -711,14 +711,14 @@ class DictProxyField(object):
         if getattr(obj, self._fld_name) is None:
             return
         return {self._key_type(k): v
-                for k, v in six.iteritems(getattr(obj, self._fld_name))}
+                for k, v in getattr(obj, self._fld_name).items()}
 
     def __set__(self, obj, val):
         if val is None:
             setattr(obj, self._fld_name, val)
         else:
             setattr(obj, self._fld_name,
-                    {six.text_type(k): v for k, v in six.iteritems(val)})
+                    {six.text_type(k): v for k, v in val.items()})
 
 
 class Set(CompoundFieldType):
@@ -1266,7 +1266,7 @@ class CoercedDict(CoercedCollectionMixin, dict):
 
     def _coerce_dict(self, d):
         res = {}
-        for key, element in six.iteritems(d):
+        for key, element in d.items():
             res[key] = self._coerce_item(key, element)
         return res
 
diff --git a/oslo_versionedobjects/fixture.py b/oslo_versionedobjects/fixture.py
index 407b908..b431950 100644
--- a/oslo_versionedobjects/fixture.py
+++ b/oslo_versionedobjects/fixture.py
@@ -124,7 +124,7 @@ class FakeIndirectionAPI(base.VersionedObjectIndirectionAPI):
         kwargs = dict(
             [(argname, self._ser.deserialize_entity(
                 context, self._ser.serialize_entity(context, arg)))
-             for argname, arg in six.iteritems(kwargs)])
+             for argname, arg in kwargs.items()])
         return args, kwargs
 
     def object_action(self, context, objinst, objmethod, args, kwargs):