diff --git a/devices/xps13/configuration.nix b/devices/xps13/configuration.nix
index 615e2a6..a07f4b5 100644
--- a/devices/xps13/configuration.nix
+++ b/devices/xps13/configuration.nix
@@ -1,34 +1,42 @@
 # Edit this configuration file to define what should be installed on
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
-
-{ config, pkgs, ... }:
-
 {
-  imports = [ # Include the results of the hardware scan.
+  config,
+  pkgs,
+  ...
+}: {
+  imports = [
+    # Include the results of the hardware scan.
     ./hardware-configuration.nix
   ];
 
-	hardware.bluetooth = {
-		enable = true;
-		powerOnBoot = true;
-	};
-	services.blueman.enable = true;
+  hardware.bluetooth = {
+    enable = true;
+    powerOnBoot = true;
+  };
+  services.blueman.enable = true;
 
   # Bootloader.
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
-	boot.kernelModules = [ "msr" ];
+  boot.kernelModules = ["msr"];
 
   networking.hostName = "nixos"; # Define your hostname.
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
 
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
-	nix.settings.trusted-users = [ "polen" ];
-	# nix.settings.extra-platforms = config.boot.binfmt.emulatedSystems;
-	# boot.binfmt.emulatedSystems = ["aarch64-linux"];
-
+  nix = {
+    settings.experimental-features = ["nix-command" "flakes"];
+    settings.trusted-users = ["polen"];
+    # settings.extra-platforms = config.boot.binfmt.emulatedSystems;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "--delete-older-than 15d";
+    };
+  };
+  # boot.binfmt.emulatedSystems = ["aarch64-linux"];
 
   # Configure network proxy if necessary
   # networking.proxy.default = "http://user:password@proxy:port/";
@@ -50,16 +58,16 @@
     xkb.variant = "";
   };
 
-	services.displayManager.sddm = {
-		enable = true;
-		theme = "${import ./sddm-theme.nix { inherit pkgs; }}";
-	};
+  services.displayManager.sddm = {
+    enable = true;
+    theme = "${import ./sddm-theme.nix {inherit pkgs;}}";
+  };
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.polen = {
     isNormalUser = true;
     description = "polen";
-    extraGroups = [ "networkmanager" "wheel" ];
+    extraGroups = ["networkmanager" "wheel"];
     shell = pkgs.zsh;
   };
 
@@ -76,9 +84,9 @@
     ranger
     git
     home-manager
-		sops
+    sops
 
-		# Desktop
+    # Desktop
     waybar
     mako
     swww
@@ -91,8 +99,8 @@
     libsForQt5.qt5.qtquickcontrols2
     libsForQt5.qt5.qtgraphicaleffects
 
-		# Nix related
-		nixfmt-classic
+    # Nix related
+    nixfmt-classic
   ];
 
   programs.zsh.enable = true;
@@ -115,10 +123,10 @@
   programs.seahorse.enable = true;
 
   xdg.portal.enable = true;
-  xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
+  xdg.portal.extraPortals = [pkgs.xdg-desktop-portal-gtk];
 
-  environment.sessionVariables = { 
-    NIXOS_OZONE_WL = "1"; 
+  environment.sessionVariables = {
+    NIXOS_OZONE_WL = "1";
     QT_SCALE_FACTOR_ROUNDING_POLICY = "RoundPreferFloor";
   };
 
@@ -154,5 +162,4 @@
   # Before changing this value read the documentation for this option
   # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
   system.stateVersion = "23.11"; # Did you read the comment?
-
 }