diff --git a/pkgs/development/python-modules/pytz/default.nix b/pkgs/development/python-modules/pytz/default.nix
index 734fbbba7179..7eb9ada5cae7 100644
--- a/pkgs/development/python-modules/pytz/default.nix
+++ b/pkgs/development/python-modules/pytz/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "pytz";
-  version = "2018.4";
+  version = "2018.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749";
+    sha256 = "ffb9ef1de172603304d9d2819af6f5ece76f2e85ec10692a524dd876e72bf277";
   };
 
   checkPhase = ''