diff --git a/configuration.nix b/configuration.nix
index 7817095..17608e6 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -1,8 +1,9 @@
 { config, pkgs, ... }:
 let
   secrets = import ./secrets.nix;
+  hostname = "mail-dumpstack-io";
   domain = "dumpstack.io";
-  branch = "20.03";
+  branch = "20.09";
 in {
   imports = [
     ./hardware-configuration.nix
@@ -19,7 +20,7 @@ in {
   boot.loader.grub.version = 2;
   boot.loader.grub.device = "/dev/vda";
 
-  networking.hostName = "mail.${domain}";
+  networking.hostName = hostname;
 
   networking.firewall.allowedTCPPorts = [ 443 ];
 
@@ -55,7 +56,7 @@ in {
   };
 
   # read release notes carefully before changing it
-  system.stateVersion = "20.03";
+  system.stateVersion = "20.09";
 
   nix = {
     optimise.automatic = true;