diff --git a/src/allmydata/test/mutable/test_version.py b/src/allmydata/test/mutable/test_version.py
index aa6fb539f..669baa8db 100644
--- a/src/allmydata/test/mutable/test_version.py
+++ b/src/allmydata/test/mutable/test_version.py
@@ -2,17 +2,9 @@
 Tests related to the way ``allmydata.mutable`` handles different versions
 of data for an object.
 """
-from __future__ import print_function
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import unicode_literals
-
-from future.utils import PY2
-if PY2:
-    from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min  # noqa: F401
 
+from io import StringIO
 import os
-from six.moves import cStringIO as StringIO
 
 from twisted.internet import defer
 from ..common import AsyncTestCase