diff --git a/config/nix.nix b/config/nix.nix
index 9b0f94f..c693596 100644
--- a/config/nix.nix
+++ b/config/nix.nix
@@ -2,6 +2,7 @@
 
 let
   cfg = config.machine;
+  emptyGlobalRegistry = pkgs.writeText "registry.json" ''{ "flakes": [], "version": 2 }'';
 in {
   nix = {
     package = pkgs.nix;
@@ -24,6 +25,7 @@ in {
     extraOptions = ''
       build-timeout = 86400  # 24 hours
       experimental-features = nix-command flakes
+      flake-registry = ${emptyGlobalRegistry}
     '';
   };
 }
diff --git a/flake.lock b/flake.lock
index dce8dec..1c57b44 100644
--- a/flake.lock
+++ b/flake.lock
@@ -38,14 +38,15 @@
         "flake-compat": "flake-compat",
         "nixpkgs": "nixpkgs",
         "nixpkgs-22_11": "nixpkgs-22_11",
+        "nixpkgs-23_05": "nixpkgs-23_05",
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1684964237,
-        "narHash": "sha256-dDS+GhdZN2MAa2FJKFGM2gpgAXhx+xoMkpVsRx9qpDE=",
+        "lastModified": 1687462267,
+        "narHash": "sha256-rNSputjn/0HEHHnsKfQ8mQVEPVchcBw7DsbND7Wg8dk=",
         "owner": "simple-nixos-mailserver",
         "repo": "nixos-mailserver",
-        "rev": "1bcfcf786bc289ca1bd2c9d29d6f02d9141b1da3",
+        "rev": "24128c3052090311688b09a400aa408ba61c6ee5",
         "type": "gitlab"
       },
       "original": {
@@ -84,13 +85,28 @@
         "type": "indirect"
       }
     },
-    "nixpkgs-git": {
+    "nixpkgs-23_05": {
       "locked": {
-        "lastModified": 1686091955,
-        "narHash": "sha256-tsKpHCtSbPw0A1eQn9FCGWZGbHb682lGwd3+HHlJvSo=",
+        "lastModified": 1684782344,
+        "narHash": "sha256-SHN8hPYYSX0thDrMLMWPWYulK3YFgASOrCsIL3AJ78g=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a4b903646ce5f446877662a851ab1cc206b4d708",
+        "rev": "8966c43feba2c701ed624302b6a935f97bcbdf88",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-23.05",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs-git": {
+      "locked": {
+        "lastModified": 1687787003,
+        "narHash": "sha256-xGUdxBgnhmZOp1PeTmFzTIlcVCrLfgg9OW3bCeGb9JQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "be10d3e74bde445af511a399d082dc7dc5c1c89a",
         "type": "github"
       },
       "original": {
@@ -101,11 +117,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1685883127,
-        "narHash": "sha256-zPDaPNrAtBnO24rNqjHLINHsqTdRbgWy1c/TL3EdwlM=",
+        "lastModified": 1687596132,
+        "narHash": "sha256-snkoTnUJQICNvg7b+DfxPLnIen6FIucM95niW95vTJI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "d4a9ff82fc18723219b60c66fb2ccb0734c460eb",
+        "rev": "9dbd51e1f1ed01893caffb7fe25c422cb10b8282",
         "type": "github"
       },
       "original": {
@@ -117,27 +133,27 @@
     },
     "nixpkgs-stable_2": {
       "locked": {
-        "lastModified": 1685758009,
-        "narHash": "sha256-IT4Z5WGhafrq+xbDTyuKrRPRQ1f+kVOtE+4JU1CHFeo=",
+        "lastModified": 1687031877,
+        "narHash": "sha256-yMFcVeI+kZ6KD2QBrFPNsvBrLq2Gt//D0baHByMrjFY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "eaf03591711b46d21abc7082a8ebee4681f9dbeb",
+        "rev": "e2e2059d19668dab1744301b8b0e821e3aae9c99",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "release-22.11",
+        "ref": "release-23.05",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1685931219,
-        "narHash": "sha256-8EWeOZ6LKQfgAjB/USffUSELPRjw88A+xTcXnOUvO5M=",
+        "lastModified": 1687681650,
+        "narHash": "sha256-M2If+gRcfpmaJy/XbfSsRzLlPpoU4nr0NHnKKl50fd8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "7409480d5c8584a1a83c422530419efe4afb0d19",
+        "rev": "1c9db9710cb23d60570ad4d7ab829c2d34403de3",
         "type": "github"
       },
       "original": {
@@ -149,11 +165,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1685931219,
-        "narHash": "sha256-8EWeOZ6LKQfgAjB/USffUSELPRjw88A+xTcXnOUvO5M=",
+        "lastModified": 1687681650,
+        "narHash": "sha256-M2If+gRcfpmaJy/XbfSsRzLlPpoU4nr0NHnKKl50fd8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "7409480d5c8584a1a83c422530419efe4afb0d19",
+        "rev": "1c9db9710cb23d60570ad4d7ab829c2d34403de3",
         "type": "github"
       },
       "original": {
@@ -181,11 +197,11 @@
         "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
-        "lastModified": 1685848844,
-        "narHash": "sha256-Iury+/SVbAwLES76QJSiKFiQDzmf/8Hsq8j54WF2qyw=",
+        "lastModified": 1687398569,
+        "narHash": "sha256-e/umuIKFcFtZtWeX369Hbdt9r+GQ48moDmlTcyHWL28=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "a522e12ee35e50fa7d902a164a9796e420e6e75b",
+        "rev": "2ff6973350682f8d16371f8c071a304b8067f192",
         "type": "github"
       },
       "original": {