diff --git a/flake.lock b/flake.lock
index fa78fdc..a120c53 100644
--- a/flake.lock
+++ b/flake.lock
@@ -236,11 +236,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1691506824,
-        "narHash": "sha256-Z2Ms7036CCEAfCmDBDy+sFauO6/7fx2UN3aoPCpp4tA=",
+        "lastModified": 1691882297,
+        "narHash": "sha256-e1/LAQSGLnBywfA1TfMl0Vj3tvYka73XOZ/D2/CJowE=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "7b8d43fbaf8450c30caaed5eab876897d0af891b",
+        "rev": "c3ab5ea047e6dc73df530948f7367455749d8906",
         "type": "github"
       },
       "original": {
@@ -354,11 +354,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1691368598,
-        "narHash": "sha256-ia7li22keBBbj02tEdqjVeLtc7ZlSBuhUk+7XTUFr14=",
+        "lastModified": 1691654369,
+        "narHash": "sha256-gSILTEx1jRaJjwZxRlnu3ZwMn1FVNk80qlwiCX8kmpo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5a8e9243812ba528000995b294292d3b5e120947",
+        "rev": "ce5e4a6ef2e59d89a971bc434ca8ca222b9c7f5e",
         "type": "github"
       },
       "original": {
diff --git a/sys/mailserver/default.nix b/sys/mailserver/default.nix
index 28cd5bd..6e9a2e8 100644
--- a/sys/mailserver/default.nix
+++ b/sys/mailserver/default.nix
@@ -1,5 +1,18 @@
 { pkgs, ... }: {
 
+  nix = {
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
+
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+    };
+  };
+
   mailserver = {
     enable = true;
     fqdn = "mail.idimitrov.dev";