diff --git a/pkgs/development/python-modules/pytz/default.nix b/pkgs/development/python-modules/pytz/default.nix
index 65f3d80bdaa..734fbbba717 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 = "2018.3";
+  version = "2018.4";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "410bcd1d6409026fbaa65d9ed33bf6dd8b1e94a499e32168acfc7b332e4095c0";
+    sha256 = "c06425302f2cf668f1bba7a0a03f3c1d34d4ebeef2c72003da308b3947c7f749";
   };
 
   checkPhase = ''