diff --git a/oslo_serialization/jsonutils.py b/oslo_serialization/jsonutils.py
index e96c28a..7df6496 100644
--- a/oslo_serialization/jsonutils.py
+++ b/oslo_serialization/jsonutils.py
@@ -150,7 +150,7 @@ def to_primitive(value, convert_instances=False, convert_datetime=True,
                                       encoding=encoding)
         if isinstance(value, dict):
             return {recursive(k): recursive(v)
-                    for k, v in six.iteritems(value)}
+                    for k, v in value.items()}
         elif hasattr(value, 'iteritems'):
             return recursive(dict(value.iteritems()), level=level + 1)
         # Python 3 does not have iteritems
diff --git a/oslo_serialization/msgpackutils.py b/oslo_serialization/msgpackutils.py
index af76c4c..4206ab4 100644
--- a/oslo_serialization/msgpackutils.py
+++ b/oslo_serialization/msgpackutils.py
@@ -172,7 +172,7 @@ class HandlerRegistry(object):
     def copy(self, unfreeze=False):
         """Deep copy the given registry (and its handlers)."""
         c = type(self)()
-        for ident, handlers in six.iteritems(self._handlers):
+        for ident, handlers in self._handlers.items():
             cloned_handlers = []
             for h in handlers:
                 if hasattr(h, 'copy'):