--- requirements.txt.orig	2016-05-20 05:21:44.000000000 -0600
+++ requirements.txt	2016-05-23 07:45:17.513329965 -0600
@@ -3,5 +3,5 @@ pybtex>=0.17
 pybtex-docutils>=0.2.0
 six>=1.4.1
 Sphinx>=1.0
-oset>=0.1.3
+orderedset>=2.0
 
--- sphinxcontrib/bibtex/cache.py.orig	2016-05-20 05:21:44.000000000 -0600
+++ sphinxcontrib/bibtex/cache.py	2016-05-23 07:45:17.514329884 -0600
@@ -24,7 +24,7 @@ except ImportError:  # pragma: no cover
 import ast
 import collections
 import copy
-from oset import oset
+from orderedset import OrderedSet
 import re
 
 
@@ -200,7 +200,7 @@ class Cache:
 
         self.bibfiles = {}
         self._bibliographies = collections.defaultdict(dict)
-        self._cited = collections.defaultdict(oset)
+        self._cited = collections.defaultdict(OrderedSet)
         self._enum_count = {}
 
     def purge(self, docname):