diff --git a/flake.lock b/flake.lock
index 5fcba7d..801872b 100644
--- a/flake.lock
+++ b/flake.lock
@@ -181,11 +181,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1695984718,
-        "narHash": "sha256-LQwKgaaaFOkIcxarf0xQXeDJFwZ5BZWcgmPeo3xp2CM=",
+        "lastModified": 1699783872,
+        "narHash": "sha256-4zTwLT2LL45Nmo6iwKB3ls3hWodVP9DiSWxki/oewWE=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "4f02e35f9d150573e1a710afa338846c2f6d850c",
+        "rev": "280721186ab75a76537713ec310306f0eba3e407",
         "type": "github"
       },
       "original": {
@@ -201,11 +201,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1696036838,
-        "narHash": "sha256-GmzS2RWWG98Lw/NsXlBpVxBfH9deP6UtyB/IKj/vKUw=",
+        "lastModified": 1700011274,
+        "narHash": "sha256-NtZqLNEjgaCGowT2+HEeOoZsXqVSAZMA/vk2t0jikN0=",
         "owner": "nix-community",
         "repo": "nix-vscode-extensions",
-        "rev": "d9c11ddc1817497981466faba1fc7b8d1ea4f865",
+        "rev": "a8c236477b4251ba739463de7e863a07b124fdd3",
         "type": "github"
       },
       "original": {
@@ -237,11 +237,11 @@
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1695887975,
-        "narHash": "sha256-u3+5FR12dI305jCMb0fJNQx2qwoQ54lv1tPoEWp0hmg=",
+        "lastModified": 1699997707,
+        "narHash": "sha256-ugb+1TGoOqqiy3axyEZpfF6T4DQUGjfWZ3Htry1EfvI=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "adcfd6aa860d1d129055039696bc457af7d50d0e",
+        "rev": "5689f3ebf899f644a1aabe8774d4f37eb2f6c2f9",
         "type": "github"
       },
       "original": {
@@ -269,11 +269,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1695825837,
-        "narHash": "sha256-4Ne11kNRnQsmSJCRSSNkFRSnHC4Y5gPDBIQGjjPfJiU=",
+        "lastModified": 1699596684,
+        "narHash": "sha256-XSXP8zjBZJBVvpNb2WmY0eW8O2ce+sVyj1T0/iBRIvg=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "5cfafa12d57374f48bcc36fda3274ada276cf69e",
+        "rev": "da4024d0ead5d7820f6bd15147d3fe2a0c0cec73",
         "type": "github"
       },
       "original": {
@@ -285,11 +285,11 @@
     },
     "nixpkgs-stable_2": {
       "locked": {
-        "lastModified": 1694908564,
-        "narHash": "sha256-ducA98AuWWJu5oUElIzN24Q22WlO8bOfixGzBgzYdVc=",
+        "lastModified": 1699756042,
+        "narHash": "sha256-bHHjQQBsEPOxLL+klYU2lYshDnnWY12SewzQ7n5ab2M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "596611941a74be176b98aeba9328aa9d01b8b322",
+        "rev": "9502d0245983bb233da8083b55d60d96fd3c29ff",
         "type": "github"
       },
       "original": {
@@ -301,27 +301,27 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "dirtyRev": "5b78f2a4b69d95016f8dd9f2e931cbf83d4dab07-dirty",
-        "dirtyShortRev": "5b78f2a4-dirty",
-        "lastModified": 1695994956,
-        "narHash": "sha256-cFTJutLWWzMhidPHVDgBjdr4BtarTshnbAnvGbGvfOg=",
-        "shallow": true,
-        "type": "git",
-        "url": "file:///home/xin/repo/GitHub/xinyangli/nixpkgs"
+        "lastModified": 1699781429,
+        "narHash": "sha256-UYefjidASiLORAjIvVsUHG6WBtRhM67kTjEY4XfZOFs=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e44462d6021bfe23dfb24b775cc7c390844f773d",
+        "type": "github"
       },
       "original": {
-        "shallow": true,
-        "type": "git",
-        "url": "file:///home/xin/repo/GitHub/xinyangli/nixpkgs"
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
       }
     },
     "nur": {
       "locked": {
-        "lastModified": 1696042552,
-        "narHash": "sha256-/n20VRUYywPiV5MS9eUoFMbuvX8m0gM3pHdKHW8Ah64=",
+        "lastModified": 1700012630,
+        "narHash": "sha256-m+FOsAtH3He/QoiPqJ/MuF9aw0P/+47vZ3H24pB9MaI=",
         "owner": "nix-community",
         "repo": "NUR",
-        "rev": "33b3ce67676a10b875dc58d187120b47e61b90a3",
+        "rev": "89fdcae74a069abd30b4d26ed043853b338ba88c",
         "type": "github"
       },
       "original": {
@@ -396,11 +396,11 @@
         "nixpkgs-stable": "nixpkgs-stable_2"
       },
       "locked": {
-        "lastModified": 1695284550,
-        "narHash": "sha256-z9fz/wz9qo9XePEvdduf+sBNeoI9QG8NJKl5ssA8Xl4=",
+        "lastModified": 1699951338,
+        "narHash": "sha256-1GeczM7XfgHcYGYiYNcdwSFu3E62vmh4d7mffWZvyzE=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "2f375ed8702b0d8ee2430885059d5e7975e38f78",
+        "rev": "0e3a94167dcd10a47b89141f35b2ff9e04b34c46",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 0a388ab..aed019b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
   inputs = {
-    # nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    nixpkgs.url = "/home/xin/repo/GitHub/xinyangli/nixpkgs";
+    # Pin nixpkgs to a specific commit
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-23.05";
 
     home-manager = {
diff --git a/home/xin/common/default.nix b/home/xin/common/default.nix
index 3c665c6..088d6a6 100644
--- a/home/xin/common/default.nix
+++ b/home/xin/common/default.nix
@@ -26,7 +26,6 @@
     tealdeer
     neofetch
     rclone
-    clash
 
     inetutils
   ];
diff --git a/machines/calcite/configuration.nix b/machines/calcite/configuration.nix
index a5d45f8..ffc1a28 100644
--- a/machines/calcite/configuration.nix
+++ b/machines/calcite/configuration.nix
@@ -7,7 +7,6 @@
       ./hardware-configuration.nix
       ./network.nix
       ../sops.nix
-      ../clash.nix
     ];
 
   # Bootloader.
diff --git a/machines/clash.nix b/machines/clash.nix
deleted file mode 100644
index e6c76ca..0000000
--- a/machines/clash.nix
+++ /dev/null
@@ -1,34 +0,0 @@
-{ config, lib, pkgs, ... }:
-{
-  sops = {
-    secrets.clash_subscription_link = { 
-      owner = "xin";
-    };
-  };
-
-  systemd.timers."clash-config-update" = {
-    wantedBy = [ "timers.target" ];
-    timerConfig = {
-      OnUnitActiveSec = "1d";
-      Unit = "clash-config-update.service";
-    };
-  };
-
-  systemd.services."clash-config-update" = {
-    script = ''
-      ${pkgs.curl}/bin/curl $(${pkgs.coreutils}/bin/cat ${config.sops.secrets.clash_subscription_link.path}) > /tmp/config.yaml && mv /tmp/config.yaml /home/xin/.config/clash/ 
-    '';
-    serviceConfig = {
-      Type = "oneshot";
-      User= "xin";
-    };
-  };
-
-  systemd.services.clash = {
-    enable = true;
-    after = [ "network.target" ];
-    wantedBy = [ "multi-user.target" ];
-    serviceConfig.ExecStart = "${pkgs.clash}/bin/clash -d /home/xin/.config/clash";
-  };
-  
-}
diff --git a/machines/massicot/default.nix b/machines/massicot/default.nix
index 9d48c08..955d647 100644
--- a/machines/massicot/default.nix
+++ b/machines/massicot/default.nix
@@ -46,5 +46,11 @@
     ];
     hashedPassword = "$y$j9T$JOJn97hZndiDamUmmT.iq.$ue7gNZz/b14ur8GhyutOCvFjsv.3rcsHmk7m.WRk6u7";
   };
+
+  security.sudo.extraRules = [
+    { users = [ "xin" ];
+      commands = [ { command = "ALL"; options = [ "NOPASSWD" ]; } ];
+    }
+  ];
   
 }
diff --git a/machines/raspite/configuration.nix b/machines/raspite/configuration.nix
index b178e9e..72b7978 100644
--- a/machines/raspite/configuration.nix
+++ b/machines/raspite/configuration.nix
@@ -10,13 +10,11 @@
   ];
   
   imports = [
-    ../clash.nix
     ../sops.nix
   ];
 
   environment.systemPackages = with pkgs; [
     git
-    clash
   ];
 
   # Use mirror for binary cache
@@ -59,4 +57,4 @@
     hashedPassword = "$y$j9T$KEOMZBlXtudOYWq/elAdI.$Vd3X8rjEplbuRBeZPp.8/gpL3zthpBNjhBR47wFc8D4";
   };
   
-}
\ No newline at end of file
+}