diff --git a/pkgs/development/python-modules/arrow/default.nix b/pkgs/development/python-modules/arrow/default.nix
index 65f4ae79f4b..0a8e7e6f482 100644
--- a/pkgs/development/python-modules/arrow/default.nix
+++ b/pkgs/development/python-modules/arrow/default.nix
@@ -1,21 +1,22 @@
 { stdenv, buildPythonPackage, fetchPypi
 , nose, chai, simplejson, backports_functools_lru_cache
-, dateutil }:
+, dateutil, pytz
+}:
 
 buildPythonPackage rec {
   pname = "arrow";
-  version = "0.12.1";
+  version = "0.13.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "a558d3b7b6ce7ffc74206a86c147052de23d3d4ef0e17c210dd478c53575c4cd";
+    sha256 = "6f54d9f016c0b7811fac9fb8c2c7fa7421d80c54dbdd75ffb12913c55db60b8a";
   };
 
   checkPhase = ''
     nosetests --cover-package=arrow
   '';
 
-  checkInputs = [ nose chai simplejson ];
+  checkInputs = [ nose chai simplejson pytz ];
   propagatedBuildInputs = [ dateutil backports_functools_lru_cache ];
 
   postPatch = ''