diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 027339302c22..ef0165efb269 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -20244,13 +20244,17 @@ in modules // {
 
   pytz = buildPythonPackage rec {
     name = "pytz-${version}";
-    version = "2016.3";
+    version = "2016.6.1";
 
     src = pkgs.fetchurl {
       url = "mirror://pypi/p/pytz/${name}.tar.gz";
-      sha256 = "1a3hjclyylc4m1v1dn04b38wm2vl649ijdswpg0d8m8n0lcxlj9l";
+      sha256 = "6f57732f0f8849817e9853eb9d50d85d1ebb1404f702dbc44ee627c642a486ca";
     };
 
+    checkPhase = ''
+      ${python.interpreter} -m unittest discover -s pytz/tests
+    '';
+
     meta = {
       description = "World timezone definitions, modern and historical";
       homepage = "http://pythonhosted.org/pytz";