diff --git a/flake.lock b/flake.lock
index 38a4303..818a43f 100644
--- a/flake.lock
+++ b/flake.lock
@@ -130,6 +130,21 @@
         "type": "indirect"
       }
     },
+    "nixpkgs-23_11": {
+      "locked": {
+        "lastModified": 1705774713,
+        "narHash": "sha256-j6ADaDH9XiumUzkTPlFyCBcoWYhO83lfgiSqEJF2zcs=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "1b64fc1287991a9cce717a01c1973ef86cb1af0b",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.11",
+        "type": "indirect"
+      }
+    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1705847418,
@@ -177,19 +192,20 @@
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-22_11": "nixpkgs-22_11",
         "nixpkgs-23_05": "nixpkgs-23_05",
+        "nixpkgs-23_11": "nixpkgs-23_11",
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1687462267,
-        "narHash": "sha256-rNSputjn/0HEHHnsKfQ8mQVEPVchcBw7DsbND7Wg8dk=",
+        "lastModified": 1703023684,
+        "narHash": "sha256-XQU4OaacV0F2tf9cNAvIMqlC0HBIrAtvb0MLjIHt+7M=",
         "owner": "simple-nixos-mailserver",
         "repo": "nixos-mailserver",
-        "rev": "24128c3052090311688b09a400aa408ba61c6ee5",
+        "rev": "4bfb8eb058f098302c97b909df2d019926e11220",
         "type": "gitlab"
       },
       "original": {
         "owner": "simple-nixos-mailserver",
-        "ref": "nixos-23.05",
+        "ref": "nixos-23.11",
         "repo": "nixos-mailserver",
         "type": "gitlab"
       }
diff --git a/flake.nix b/flake.nix
index 337bdfa..585b96e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,7 +7,7 @@
       url = "github:nix-community/nixos-generators";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-23.05";
+    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-23.11";
   };
 
   outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-23-05, nixos-generators, simple-nixos-mailserver, ... }@inputs:
diff --git a/hosts.nix b/hosts.nix
index aee856e..dd86f1c 100644
--- a/hosts.nix
+++ b/hosts.nix
@@ -53,12 +53,10 @@ in
       site = "io";
     };
     mail-1 = {
-      hostNixpkgs = nixpkgs-23-05;
       site = "vs";
       environment = "proxmox";
     };
     mail-2 = {
-      hostNixpkgs = nixpkgs-23-05;
       site = "wg";
       environment = "proxmox";
     };