diff --git a/desktop/default.nix b/desktop/default.nix
index dc18178d..a2bc9aa5 100644
--- a/desktop/default.nix
+++ b/desktop/default.nix
@@ -9,8 +9,8 @@
 
   # Configure keymap in X11
   services.xserver = {
-    layout = "us";
-    xkbVariant = "";
+    xkb.layout = "us";
+    xkb.variant = "";
   };
 
   ## Needed for Flatpaks
diff --git a/flake.lock b/flake.lock
index 57c5cba4..da2cc9b3 100644
--- a/flake.lock
+++ b/flake.lock
@@ -6,6 +6,27 @@
           "nixpkgs"
         ]
       },
+      "locked": {
+        "lastModified": 1709204054,
+        "narHash": "sha256-U1idK0JHs1XOfSI1APYuXi4AEADf+B+ZU4Wifc0pBHk=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "2f3367769a93b226c467551315e9e270c3f78b15",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "home-manager-stable": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs-stable"
+        ]
+      },
       "locked": {
         "lastModified": 1706981411,
         "narHash": "sha256-cLbLPTL1CDmETVh4p0nQtvoF+FSEjsnJTFpTxhXywhQ=",
@@ -23,16 +44,16 @@
     },
     "nix-flatpak": {
       "locked": {
-        "lastModified": 1699563939,
-        "narHash": "sha256-2Z4IP5Vb7jDVaDrKMO1tzLvpfuBpgTk9kJ2Okurv7rc=",
+        "lastModified": 1708268179,
+        "narHash": "sha256-NNVuhf84AeDTxadfSGnFqPHR0ED+QyM2gmu+Wyz6PrY=",
         "owner": "gmodena",
         "repo": "nix-flatpak",
-        "rev": "df3ea9930422fb14bf00e857ff771ddb85aafba6",
+        "rev": "a243cb0522f6240c194b873dde68e25370b06034",
         "type": "github"
       },
       "original": {
         "owner": "gmodena",
-        "ref": "v0.1.0",
+        "ref": "v0.3.0",
         "repo": "nix-flatpak",
         "type": "github"
       }
@@ -54,6 +75,22 @@
       }
     },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1709237383,
+        "narHash": "sha256-cy6ArO4k5qTx+l5o+0mL9f5fa86tYUX3ozE1S+Txlds=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1536926ef5621b09bba54035ae2bb6d806d72ac8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-stable": {
       "locked": {
         "lastModified": 1709309926,
         "narHash": "sha256-VZFBtXGVD9LWTecGi6eXrE0hJ/mVB3zGUlHImUs2Qak=",
@@ -72,9 +109,11 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
+        "home-manager-stable": "home-manager-stable",
         "nix-flatpak": "nix-flatpak",
         "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-stable": "nixpkgs-stable"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 2cbc7d40..348e511e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,27 +2,40 @@
   description = "Aly's NixOS configuration.";
 
   inputs = {
-    # Main NixOS channel
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
+    # Unstable NixOS channel.
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
-    # Declarative Flatpaks
-    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=v0.1.0";
+    # Release NixOS channel.
+    nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-23.11";
 
-    # Home-manager, used for managing user configuration
+    # Declarative Flatpaks.
+    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=v0.3.0";
+
+    # Home-manager, used for managing user configuration.
     home-manager = {
-      url = "github:nix-community/home-manager/release-23.11";
+      url = "github:nix-community/home-manager/master";
       # The `follows` keyword in inputs is used for inheritance.
       # Here, `inputs.nixpkgs` of home-manager is kept consistent with
       # the `inputs.nixpkgs` of the current flake,
       # to avoid problems caused by different versions of nixpkgs.
       inputs.nixpkgs.follows = "nixpkgs";
     };
+      # Home-manager, used for managing user configuration.
+    home-manager-stable = {
+      url = "github:nix-community/home-manager/release-23.11";
+      # The `follows` keyword in inputs is used for inheritance.
+      # Here, `inputs.nixpkgs` of home-manager is kept consistent with
+      # the `inputs.nixpkgs` of the current flake,
+      # to avoid problems caused by different versions of nixpkgs.
+      inputs.nixpkgs.follows = "nixpkgs-stable";
+    };
     
     # Pre-baked hardware support for various devices.
     nixos-hardware.url = "github:NixOS/nixos-hardware/master";
   };
 
-  outputs = inputs@{ nixpkgs, nix-flatpak, home-manager, nixos-hardware, ... }: {
+  outputs = inputs@{ nixpkgs, nixpkgs-stable, nix-flatpak, home-manager, home-manager-stable, nixos-hardware, ... }: {
+
     nixosConfigurations = {
       
       # T440p with i5-4210M and 16GB RAM.
diff --git a/system/network/default.nix b/system/network/default.nix
index fdac969c..9c4ff2c0 100644
--- a/system/network/default.nix
+++ b/system/network/default.nix
@@ -8,7 +8,7 @@
 
   # Enable avahi.
   services.avahi.enable = true;
-  services.avahi.nssmdns = true;
+  services.avahi.nssmdns4 = true;
   services.avahi.publish.enable = true;
   services.avahi.publish.addresses = true;
   services.avahi.publish.workstation = true;