diff --git a/flake.lock b/flake.lock
index dbaa17d..03bde78 100644
--- a/flake.lock
+++ b/flake.lock
@@ -251,6 +251,32 @@
       }
     },
     "nixpkgs_5": {
+      "locked": {
+        "lastModified": 1786106723,
+        "narHash": "sha256-CgKDSHL6rqAAQkkvg1xaZDQXb77+4XW73iGcUMJ+2w0=",
+        "rev": "f13ff45afd1bb73e640eaa08a7066dbed07e3238",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1049422.f13ff45afd1b/nixexprs.tar.zst"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst"
+      }
+    },
+    "nixpkgs_6": {
+      "locked": {
+        "lastModified": 1786384358,
+        "narHash": "sha256-OETwiymkMwunF+pfL25DzLMF2/YpMcJUjVd9qZ0YdsM=",
+        "rev": "2fcb964de67fcf60b43471c55d5d99e61a9ccb5a",
+        "type": "tarball",
+        "url": "https://releases.nixos.org/nixos/unstable/nixos-26.11pre1051473.2fcb964de67f/nixexprs.tar.zst"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://channels.nixos.org/nixos-unstable/nixexprs.tar.zst"
+      }
+    },
+    "nixpkgs_7": {
       "locked": {
         "lastModified": 1786106723,
         "narHash": "sha256-CgKDSHL6rqAAQkkvg1xaZDQXb77+4XW73iGcUMJ+2w0=",
@@ -265,9 +291,7 @@
     },
     "noctalia": {
       "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs_5"
       },
       "locked": {
         "lastModified": 1786566000,
@@ -285,9 +309,7 @@
     },
     "noctalia-greeter": {
       "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs_6"
       },
       "locked": {
         "lastModified": 1786468029,
@@ -357,7 +379,7 @@
     },
     "spicetify-nix": {
       "inputs": {
-        "nixpkgs": "nixpkgs_5",
+        "nixpkgs": "nixpkgs_7",
         "systems": "systems"
       },
       "locked": {
diff --git a/flake.nix b/flake.nix
index 55d7e72..7524df4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -18,16 +18,9 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    noctalia = {
-      url = "github:noctalia-dev/noctalia";
-      inputs.nixpkgs.follows = "nixpkgs";
-
-    };
+    noctalia.url = "github:noctalia-dev/noctalia";
 
-    noctalia-greeter = {
-      url = "github:noctalia-dev/noctalia-greeter";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
+    noctalia-greeter.url = "github:noctalia-dev/noctalia-greeter";
 
     zen-browser = {
       url = "github:youwen5/zen-browser-flake";
@@ -67,6 +60,15 @@
       ];
     in
     {
+
+      nixConfig = {
+        extra-substituters = [ "https://noctalia.cachix.org" ];
+        extra-trusted-public-keys = [
+          "noctalia.cachix.org-1:pCOR47nnMEo5thcxNDtzWpOxNFQsBRglJzxWPp3dkU4="
+        ];
+      };
+
+      
       # `sudo nixos-rebuild switch --flake .#Khaos`
       nixosConfigurations = {
         Khaos = nixpkgs.lib.nixosSystem {
diff --git a/hosts/Styx/configuration.nix b/hosts/Styx/configuration.nix
index edeb0f3..5afc547 100644
--- a/hosts/Styx/configuration.nix
+++ b/hosts/Styx/configuration.nix
@@ -39,7 +39,7 @@
 
   programs.niri = {
     enable = true;
-    package = inputs.niri.packages.${pkgs.system}.niri-unstable;
+    package = inputs.niri.packages.${pkgs.stdenv.hostPlatform.system}.niri-unstable;
   };
 
   programs.hyprland.enable = true;
@@ -197,7 +197,15 @@
 
   };
 
-  nix.settings.experimental-features = "nix-command flakes";
+  nix.settings = {
+    experimental-features = "nix-command flakes";
+
+    # # noctalia binary cache: https://docs.noctalia.dev/noctalia/getting-started/nixos/#binary-cache
+    # extra-substituters = [ "https://noctalia.cachix.org" ];
+    # extra-trusted-public-keys = [
+    #   "noctalia.cachix.org-1:pCOR47nnMEo5thcxNDtzWpOxNFQsBRglJzxWPp3dkU4="
+    # ];
+  };
 
   users.defaultUserShell = pkgs.fish;
 
@@ -218,6 +226,13 @@
       keyboard = {
         layout = "us";
       };
+      appearance = {
+        scheme = "Synced";
+        password_style = "random";
+        hide_logo = true;
+        theme_mode = "dark";
+        font_family = "TX-02";
+      };
     };
   };
 
diff --git a/modules/home/apps/spicetify.nix b/modules/home/apps/spicetify.nix
index 5e04548..610da34 100644
--- a/modules/home/apps/spicetify.nix
+++ b/modules/home/apps/spicetify.nix
@@ -8,7 +8,7 @@
 with lib;
 let
   cfg = config.nyx.spicetify;
-  spicePkgs = inputs.spicetify-nix.legacyPackages.${pkgs.system};
+  spicePkgs = inputs.spicetify-nix.legacyPackages.${pkgs.stdenv.hostPlatform.system};
 in
 {
 
diff --git a/modules/home/tools/default.nix b/modules/home/tools/default.nix
index 18b8232..4d7ffb9 100644
--- a/modules/home/tools/default.nix
+++ b/modules/home/tools/default.nix
@@ -7,7 +7,6 @@
   imports = [
     ./helix
     ./zellij
-    ./zk
     ./zed
     ./jujutsu
     ./filaments
diff --git a/modules/home/tools/filaments/default.nix b/modules/home/tools/filaments/default.nix
index 70e7c65..a010cfe 100644
--- a/modules/home/tools/filaments/default.nix
+++ b/modules/home/tools/filaments/default.nix
@@ -11,6 +11,6 @@
 
   home.packages = [
 
-    filaments.packages.${pkgs.system}.default
+    filaments.packages.${pkgs.stdenv.hostPlatform.system}.default
   ];
 }
diff --git a/users/suri/common.nix b/users/suri/common.nix
index 3928af3..eaf5e91 100644
--- a/users/suri/common.nix
+++ b/users/suri/common.nix
@@ -10,10 +10,8 @@
   nyx.fish.enable = true;
   nyx.zellij.enable = true;
   nyx.helix.enable = true;
-  nyx.zk.enable = true;
   nyx.jujutsu.enable = true;
 
-
   programs.direnv = {
     enable = true;
     enableZshIntegration = true;