diff -urN a/setup.py b/setup.py
--- a/setup.py	2016-01-07 05:03:55.000000000 +0100
+++ b/setup.py	2019-05-13 15:29:12.146161428 +0200
@@ -78,7 +78,7 @@
         'testing': tests_require,
       },
       install_requires=[
-        'repoze.who >= 2.1b1',
+        'repoze.who >= 2.1',
         'sqlalchemy >= 0.5.0',
       ],
       test_suite="nose.collector",