diff --git a/pkgs/data/misc/tzdata/default.nix b/pkgs/data/misc/tzdata/default.nix
index 59079b28efc2..0d19d8c9dcab 100644
--- a/pkgs/data/misc/tzdata/default.nix
+++ b/pkgs/data/misc/tzdata/default.nix
@@ -2,16 +2,16 @@
 
 stdenv.mkDerivation rec {
   name = "tzdata-${version}";
-  version = "2018g";
+  version = "2019a";
 
   srcs =
     [ (fetchurl {
         url = "https://data.iana.org/time-zones/releases/tzdata${version}.tar.gz";
-        sha256 = "05kayi3w9pvhj6ljx1hvwd0r8mxfzn436fjmwhx53xkj919xxpq2";
+        sha256 = "0wlpqm4asvi0waaz24xj20iq40gqfypmb4nldjhkfgm09bgnsdlh";
       })
       (fetchurl {
         url = "https://data.iana.org/time-zones/releases/tzcode${version}.tar.gz";
-        sha256 = "09y44fzcdq3c06saa8iqqa0a59cyw6ni3p31ps0j1w3hcpxz8lxa";
+        sha256 = "1x9z8fpgnhzlsnps0hamb54ymaskjab7ys9m4i4gpk9hpiig2fc7";
       })
     ];