diff --git a/pkgs/development/python-modules/pytz/default.nix b/pkgs/development/python-modules/pytz/default.nix
index 408c64190bb..cc30c802fd9 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 = "2018.7";
+  version = "2018.9";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "31cb35c89bd7d333cd32c5f278fca91b523b0834369e757f4c5641ea252236ca";
+    sha256 = "d5f05e487007e29e03409f9398d074e158d920d36eb82eaf66fb1136b0c5374c";
   };
 
   checkPhase = ''