diff --git a/flake.lock b/flake.lock
index 4f6ecdf..c56ea0c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -44,9 +44,7 @@
     },
     "dwarffs": {
       "inputs": {
-        "nix": [
-          "nix"
-        ],
+        "nix": "nix",
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -73,11 +71,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1653971985,
-        "narHash": "sha256-BxahBocT7OuJkAOV3LwLTaAjhoBQOZnnpaVCswGVLXM=",
+        "lastModified": 1653994544,
+        "narHash": "sha256-AgUcuxeFEAqxp3rS2vUwvHhhgq6rfhdKKdrIcsfOtl8=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "563a7a4b38efb5c99ef4638bfa8064136c05b19f",
+        "rev": "00cbfa093fc1a9769271f0a9ea019b1ccc569482",
         "type": "github"
       },
       "original": {
@@ -212,24 +210,20 @@
     "nix": {
       "inputs": {
         "lowdown-src": "lowdown-src",
-        "nixpkgs": [
-          "nixpkgs"
-        ],
+        "nixpkgs": "nixpkgs",
         "nixpkgs-regression": "nixpkgs-regression"
       },
       "locked": {
-        "lastModified": 1653936575,
-        "narHash": "sha256-W6aTsTpCTb+vXQEXDjnKqetOuJmEfSuK2CXvAMqwo74=",
+        "lastModified": 1646337190,
+        "narHash": "sha256-7rdubErpmKjNlmjR1GfwAyazJeqUnJUw/Xf1uon/BqQ=",
         "owner": "NixOS",
         "repo": "nix",
-        "rev": "daa14b89103b1246e8d7297ffe8ac5b4f4c8c45c",
+        "rev": "b09baf690bb00125805a02e0feae9636b2114599",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "latest-release",
-        "repo": "nix",
-        "type": "github"
+        "id": "nix",
+        "type": "indirect"
       }
     },
     "nixos-hardware": {
@@ -250,18 +244,17 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1653920503,
-        "narHash": "sha256-BBeCZwZImtjP3oYy4WogkQYy5OxNyfNciVSc1AfZgLQ=",
+        "lastModified": 1632864508,
+        "narHash": "sha256-d127FIvGR41XbVRDPVvozUPQ/uRHbHwvfyKHwEt5xFM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a634c8f6c1fbf9b9730e01764999666f3436f10a",
+        "rev": "82891b5e2c2359d7e58d08849e4c89511ab94234",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-22.05",
-        "repo": "nixpkgs",
-        "type": "github"
+        "id": "nixpkgs",
+        "ref": "nixos-21.05-small",
+        "type": "indirect"
       }
     },
     "nixpkgs-21_05": {
@@ -358,6 +351,22 @@
       }
     },
     "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1653920503,
+        "narHash": "sha256-BBeCZwZImtjP3oYy4WogkQYy5OxNyfNciVSc1AfZgLQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a634c8f6c1fbf9b9730e01764999666f3436f10a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
       "locked": {
         "lastModified": 1626852498,
         "narHash": "sha256-lOXUJvi0FJUXHTVSiC5qsMRtEUgqM4mGZpMESLuGhmo=",
@@ -379,9 +388,8 @@
         "emacs-overlay": "emacs-overlay",
         "flake-utils-plus": "flake-utils-plus",
         "home-manager": "home-manager",
-        "nix": "nix",
         "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "simple-nixos-mailserver": "simple-nixos-mailserver",
         "sops-nix": "sops-nix"
@@ -390,7 +398,7 @@
     "simple-nixos-mailserver": {
       "inputs": {
         "blobs": "blobs",
-        "nixpkgs": "nixpkgs_2",
+        "nixpkgs": "nixpkgs_3",
         "nixpkgs-21_05": "nixpkgs-21_05",
         "nixpkgs-21_11": "nixpkgs-21_11",
         "utils": "utils"
diff --git a/flake.nix b/flake.nix
index f076c3c..837c0bf 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,10 +6,11 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-    nix = {
-      url = "github:NixOS/nix?ref=latest-release";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    #nix = {
+      #      url = "github:NixOS/nix?ref=latest-release";
+    #  url = "github:NixOS/nix";
+    #  inputs.nixpkgs.follows = "nixpkgs";
+    #};
 
     nixos-hardware = {
       url = "github:NixOS/nixos-hardware/master";
@@ -41,7 +42,7 @@
     dwarffs = {
       url = "github:edolstra/dwarffs";
       inputs = {
-        nix.follows = "nix";
+        #nix.follows = "nix";
         nixpkgs.follows = "nixpkgs";
       };
     };
@@ -85,7 +86,7 @@
           unstable = channels.nixpkgs-unstable;
         })
         (flake-utils-plus.lib.genPkgOverlay inputs.comma "comma")
-        inputs.nix.overlay
+        #inputs.nix.overlay
         inputs.emacs-overlay.overlay
       ];
 
diff --git a/machines/stel-xps/default.nix b/machines/stel-xps/default.nix
index dd85a88..5090758 100644
--- a/machines/stel-xps/default.nix
+++ b/machines/stel-xps/default.nix
@@ -22,6 +22,9 @@
 #      dpi = 180;
     };
 
+    # enable deamon to generate nix-index-db
+    nix-index-db-update.enable = false;
+
     # add TUD vpn
     openvpn.enable = true;