diff --git a/flake.lock b/flake.lock
index 89fa4bb..bad48e1 100644
--- a/flake.lock
+++ b/flake.lock
@@ -297,11 +297,11 @@
     "flake-compat_2": {
       "flake": false,
       "locked": {
-        "lastModified": 1747046372,
-        "narHash": "sha256-CIVLLkVgvHYbgI2UpXvIIBJ12HWgX+fjA8Xf8PUmqCY=",
+        "lastModified": 1761588595,
+        "narHash": "sha256-XKUZz9zewJNUj46b4AJdiRZJAvSZ0Dqj2BNfXvFlJC4=",
         "owner": "edolstra",
         "repo": "flake-compat",
-        "rev": "9100a0f413b0c601e0533d1d94ffd501ce2e7885",
+        "rev": "f387cd2afec9419c8ee37694406ca490c3f34ee5",
         "type": "github"
       },
       "original": {
@@ -446,11 +446,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1742649964,
-        "narHash": "sha256-DwOTp7nvfi8mRfuL1escHDXabVXFGT1VlPD1JHrtrco=",
+        "lastModified": 1763319842,
+        "narHash": "sha256-YG19IyrTdnVn0l3DvcUYm85u3PaqBt6tI6VvolcuHnA=",
         "owner": "cachix",
         "repo": "git-hooks.nix",
-        "rev": "dcf5072734cb576d2b0c59b2ac44f5050b5eac82",
+        "rev": "7275fa67fbbb75891c16d9dee7d88e58aea2d761",
         "type": "github"
       },
       "original": {
@@ -585,20 +585,19 @@
         "git-hooks": "git-hooks",
         "nixpkgs": [
           "nixpkgs"
-        ],
-        "nixpkgs-25_05": "nixpkgs-25_05"
+        ]
       },
       "locked": {
-        "lastModified": 1763302796,
-        "narHash": "sha256-mEc3SBjRYfMcbNFLxmCc5tRtlu3j+1q7zRz+nRraSFE=",
+        "lastModified": 1766537863,
+        "narHash": "sha256-HEt+wbazRgJYeY+lgj65bxhPyVc4x7NEB2bs5NU6DF8=",
         "owner": "simple-nixos-mailserver",
         "repo": "nixos-mailserver",
-        "rev": "5b38fb599f50e9d78325d1d2706e36303c166047",
+        "rev": "23f0a53ca6e58e61e1ea2b86791c69b79c91656d",
         "type": "gitlab"
       },
       "original": {
         "owner": "simple-nixos-mailserver",
-        "ref": "nixos-25.05",
+        "ref": "nixos-25.11",
         "repo": "nixos-mailserver",
         "type": "gitlab"
       }
@@ -619,22 +618,6 @@
         "type": "github"
       }
     },
-    "nixpkgs-25_05": {
-      "locked": {
-        "lastModified": 1747610100,
-        "narHash": "sha256-rpR5ZPMkWzcnCcYYo3lScqfuzEw5Uyfh+R0EKZfroAc=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "ca49c4304acf0973078db0a9d200fd2bae75676d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-25.05",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1764242076,
diff --git a/flake.nix b/flake.nix
index c771af9..8fc0636 100644
--- a/flake.nix
+++ b/flake.nix
@@ -32,7 +32,7 @@
     };
 
     nixos-mailserver = {
-      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-25.05";
+      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-25.11";
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
diff --git a/hosts/phantom/email.nix b/hosts/phantom/email.nix
index 105113b..60207e5 100644
--- a/hosts/phantom/email.nix
+++ b/hosts/phantom/email.nix
@@ -38,12 +38,14 @@
     };
 
     enableManageSieve = true;
+
+    stateVersion = 3;
   };
 
   # Prefer ipv4 and use main ipv6 to avoid reverse DNS issues
-  services.postfix.extraConfig = ''
-    smtp_address_preference = ipv4
-  '';
+  services.postfix.settings.main = {
+    smtp_address_preference = "ipv4";
+  };
 
   # Webmail
   services.roundcube = {