diff --git a/flask/sessions.py b/flask/sessions.py
index 31b5900b..3746da7f 100644
--- a/flask/sessions.py
+++ b/flask/sessions.py
@@ -17,6 +17,7 @@ from werkzeug.datastructures import CallbackDict
 from . import Markup, json
 
 from itsdangerous import URLSafeTimedSerializer, BadSignature
+import six
 
 
 def total_seconds(td):
@@ -68,7 +69,7 @@ class TaggedJSONSerializer(object):
             elif isinstance(value, datetime):
                 return {' d': http_date(value)}
             elif isinstance(value, dict):
-                return dict((k, _tag(v)) for k, v in value.iteritems())
+                return dict((k, _tag(v)) for k, v in six.iteritems(value))
             elif isinstance(value, str):
                 try:
                     return unicode(value)
diff --git a/flask/templating.py b/flask/templating.py
index 2cc09c4d..754c6893 100644
--- a/flask/templating.py
+++ b/flask/templating.py
@@ -15,6 +15,7 @@ from jinja2 import BaseLoader, Environment as BaseEnvironment, \
 from .globals import _request_ctx_stack, _app_ctx_stack
 from .signals import template_rendered
 from .module import blueprint_is_module
+import six
 
 
 def _default_template_ctx_processor():
@@ -79,7 +80,7 @@ class DispatchingJinjaLoader(BaseLoader):
         except (ValueError, KeyError):
             pass
 
-        for blueprint in self.app.blueprints.itervalues():
+        for blueprint in six.itervalues(self.app.blueprints):
             if blueprint_is_module(blueprint):
                 continue
             loader = blueprint.jinja_loader
@@ -92,7 +93,7 @@ class DispatchingJinjaLoader(BaseLoader):
         if loader is not None:
             result.update(loader.list_templates())
 
-        for name, blueprint in self.app.blueprints.iteritems():
+        for name, blueprint in six.iteritems(self.app.blueprints):
             loader = blueprint.jinja_loader
             if loader is not None:
                 for template in loader.list_templates():