diff --git a/pkgs/by-name/tz/tzdata/package.nix b/pkgs/by-name/tz/tzdata/package.nix
index 2ee4f60dc940..3d8498c447f6 100644
--- a/pkgs/by-name/tz/tzdata/package.nix
+++ b/pkgs/by-name/tz/tzdata/package.nix
@@ -7,16 +7,16 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "tzdata";
-  version = "2024b";
+  version = "2025b";
 
   srcs = [
     (fetchurl {
       url = "https://data.iana.org/time-zones/releases/tzdata${finalAttrs.version}.tar.gz";
-      hash = "sha256-cOdU2xJqjQ2z0W1rTLX37B4E1fJhJV5FWKZ/6S055VA=";
+      hash = "sha256-EYEEEzRfx4BQF+J+qfpIhf10zWGykRcRrQOPXSjXFHQ=";
     })
     (fetchurl {
       url = "https://data.iana.org/time-zones/releases/tzcode${finalAttrs.version}.tar.gz";
-      hash = "sha256-XkOPxEliSQavFqGP9Fc3OfDNqYYuXsKNO8sZy67Q9nI=";
+      hash = "sha256-Bfj+2zUl7nDUnIfT+ueKig265P6HqlZcZc2plIrhNew=";
     })
   ];