diff --git a/flake.lock b/flake.lock
index 7de4957..008407a 100644
--- a/flake.lock
+++ b/flake.lock
@@ -372,16 +372,19 @@
         "nixpkgs": [
           "nixpkgs"
         ],
+        "nixpkgs-unstable": [
+          "nixpkgs-unstable"
+        ],
         "treefmt-nix": [
           "treefmt-nix"
         ]
       },
       "locked": {
-        "lastModified": 1782927205,
-        "narHash": "sha256-mEVguvW2a9UzLAusuVvZFt6tvOVHor/kOeQziRcLE0c=",
+        "lastModified": 1782751302,
+        "narHash": "sha256-tLcfE+pLZWnAoa/VWdFCnSKVLbVOuaRozlUnkssx7ac=",
         "ref": "refs/heads/main",
-        "rev": "ebb85e6291f1ac38dc893bac9b62c1018db9cb8b",
-        "revCount": 2254,
+        "rev": "621ee66133831158329981b498b50b4342ed4339",
+        "revCount": 2237,
         "type": "git",
         "url": "https://forge.darkest.space/hyperhive/hyperhive.git"
       },
@@ -673,11 +676,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1782821651,
-        "narHash": "sha256-D5jO0ME1lA9bDHnd5kVawBwItG/N4oZr3FlXmMzLec8=",
+        "lastModified": 1780930886,
+        "narHash": "sha256-rppURzHviaQN131F+nLiLdGfcb0uCd9gGP0E5+iw9MI=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e52c192be9d7b2c4bd4aed326c8731b35f8bb75c",
+        "rev": "8c3cede7ddc26bd659d2d383b5610efbd2c7a16e",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 2dca59f..239738e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,6 +17,7 @@
       url = "git+https://forge.darkest.space/hyperhive/hyperhive.git";
       inputs = {
         nixpkgs.follows = "nixpkgs";
+        nixpkgs-unstable.follows = "nixpkgs-unstable";
         treefmt-nix.follows = "treefmt-nix";
       };
     };
@@ -159,7 +160,7 @@
       overlays = {
         unstable = final: prev: {
           unstable = import nixpkgs-unstable {
-            inherit (prev.stdenv.hostPlatform) system;
+            localSystem = prev.stdenv.hostPlatform;
             inherit (prev) config;
           };
         };
diff --git a/nixosConfigurations/muede-lpt2/default.nix b/nixosConfigurations/muede-lpt2/default.nix
index 3fbabf3..c62e807 100644
--- a/nixosConfigurations/muede-lpt2/default.nix
+++ b/nixosConfigurations/muede-lpt2/default.nix
@@ -37,12 +37,9 @@
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIO1CRn4yYTL4XUdCebE8Z4ZeuMujBjorTdWifg911EOv pc2 home roaming"
     ];
 
-    # brightnessctl's udev rules grant the `video` group write access to backlight brightness (muede is in `video`)
-    environment.systemPackages = [
-      pkgs.android-tools
-      pkgs.brightnessctl
-    ];
-    services.udev.packages = [ pkgs.brightnessctl ];
+    # `programs.adb` removed in nixpkgs 26.05 (systemd 258 handles uaccess); add pkgs.android-tools to systemPackages if adb is needed
+    # `programs.light` removed in nixpkgs 26.05; replace with brightnessctl or hardware.acpilight when re-enabling
+    environment.systemPackages = [ pkgs.android-tools ];
 
     networking.firewall.allowedTCPPorts = [
       8776