diff --git a/raven/contrib/flask.py b/raven/contrib/flask.py
index a418da3a..444e6849 100644
--- a/raven/contrib/flask.py
+++ b/raven/contrib/flask.py
@@ -29,6 +29,7 @@ from raven.middleware import Sentry as SentryMiddleware
 from raven.handlers.logging import SentryHandler
 from raven.utils import six
 from raven.utils.compat import _urlparse
+from raven.utils.encoding import to_unicode
 from raven.utils.imports import import_string
 from raven.utils.wsgi import get_headers, get_environ
 
@@ -218,11 +219,11 @@ class Sentry(object):
         try:
             self.client.http_context(self.get_http_info(request))
         except Exception as e:
-            self.client.logger.exception(unicode(e))
+            self.client.logger.exception(to_unicode(e))
         try:
             self.client.user_context(self.get_user_info(request))
         except Exception as e:
-            self.client.logger.exception(unicode(e))
+            self.client.logger.exception(to_unicode(e))
 
     def after_request(self, sender, response, *args, **kwargs):
         if self.last_event_id:
diff --git a/raven/utils/stacks.py b/raven/utils/stacks.py
index 75a88d39..f458273f 100644
--- a/raven/utils/stacks.py
+++ b/raven/utils/stacks.py
@@ -213,7 +213,7 @@ def slim_frame_data(frames, frame_allowance=25):
 
     half_max = frame_allowance / 2
 
-    for n in xrange(half_max, frames_len - half_max):
+    for n in range(half_max, frames_len - half_max):
         # remove heavy components
         frames[n].pop('vars', None)
         frames[n].pop('pre_context', None)
diff --git a/tests/contrib/zerorpc/tests.py b/tests/contrib/zerorpc/tests.py
index 1228c9f6..1df7c285 100644
--- a/tests/contrib/zerorpc/tests.py
+++ b/tests/contrib/zerorpc/tests.py
@@ -65,7 +65,7 @@ class ZeroRPCTest(TestCase):
 
         self._client.choice([])
 
-        for attempt in xrange(0, 10):
+        for attempt in range(0, 10):
             gevent.sleep(0.1)
             if len(self._sentry.events):
                 exc = self._sentry.events[0]['exception']