diff --git a/checks/alejandra.nix b/checks/alejandra.nix
index 6191e3db..f2f45117 100644
--- a/checks/alejandra.nix
+++ b/checks/alejandra.nix
@@ -3,8 +3,11 @@
   mkTest,
   lib,
   alejandra,
+  generatedFiles,
 }: let
+  inherit (lib) concatStringsSep;
   inherit (lib.sources) sourceFilesBySuffices;
+  excludes = concatStringsSep " " (map (f: "--exclude ./${f}") generatedFiles);
 in
   mkTest {
     name = "lint-alejandra";
@@ -12,12 +15,7 @@ in
     checkInputs = [alejandra];
     checkPhase = ''
       mkdir -p $out
-      alejandra --check \
-          --exclude ./home-config/dotfiles/emacs.d/share/templates/ \
-          --exclude ./pkgs/_sources/ \
-          --exclude ./nixos-config/yui/hardware-configuration.nix \
-          --exclude ./nixos-config/ren/hardware-configuration.nix \
-          . \
-      | tee $out/test.log
+      echo alejandra --check ${excludes} . | tee $out/test.log
+      alejandra --check ${excludes} . | tee $out/test.log
     '';
   }
diff --git a/checks/deadnix.nix b/checks/deadnix.nix
new file mode 100644
index 00000000..8f279d8e
--- /dev/null
+++ b/checks/deadnix.nix
@@ -0,0 +1,24 @@
+{
+  pkgs,
+  self,
+  mkTest,
+  lib,
+  flake-inputs,
+  generatedFiles,
+}: let
+  inherit (lib) concatStringsSep;
+  inherit (lib.sources) sourceFilesBySuffices;
+
+  deadnix = flake-inputs.deadnix.packages.${pkgs.system}.default;
+
+  excludes = "--exclude ${concatStringsSep " " (map (f: "./${f}") generatedFiles)}";
+in
+  mkTest {
+    name = "lint-deadnix";
+    src = sourceFilesBySuffices self [".nix"];
+    checkInputs = [deadnix];
+    checkPhase = ''
+      mkdir -p $out
+      deadnix --fail ${excludes} | tee $out/test.log
+    '';
+  }
diff --git a/checks/default.nix b/checks/default.nix
index 31455ac4..afdf69b0 100644
--- a/checks/default.nix
+++ b/checks/default.nix
@@ -4,6 +4,14 @@
   flake-inputs,
 }: let
   inherit (lib) callPackageWith;
+
+  generatedFiles = [
+    "home-config/dotfiles/emacs.d/share/templates"
+    "pkgs/_sources"
+    "nixos-config/yui/hardware-configuration.nix"
+    "nixos-config/ren/hardware-configuration.nix"
+  ];
+
   mkTest = test:
     pkgs.stdenv.mkDerivation ({
         dontPatch = true;
@@ -13,9 +21,10 @@
         doCheck = true;
       }
       // test);
+
   callPackage = callPackageWith (pkgs
     // {
-      inherit flake-inputs mkTest;
+      inherit flake-inputs mkTest generatedFiles;
       # Work around `self` technically being a store path when
       # evaluated as a flake - `builtins.filter` can otherwise not be
       # called on it.
@@ -27,5 +36,6 @@
 in {
   # Linters and formatters
   alejandra = callPackage ./alejandra.nix {};
+  deadnix = callPackage ./deadnix.nix {};
   shellcheck = callPackage ./shellcheck.nix {};
 }
diff --git a/flake.lock b/flake.lock
index 5190655c..2286ecae 100644
--- a/flake.lock
+++ b/flake.lock
@@ -22,6 +22,26 @@
         "type": "github"
       }
     },
+    "deadnix": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1698768041,
+        "narHash": "sha256-xaaXGzTd+t1GjD2KpiS/c8acv6bXufv/lTN+ACRGVJw=",
+        "owner": "astro",
+        "repo": "deadnix",
+        "rev": "efcd46e3827d1e42e8f2f9cb045dfb34caeb43f5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "astro",
+        "repo": "deadnix",
+        "type": "github"
+      }
+    },
     "disko": {
       "inputs": {
         "nixpkgs": [
@@ -136,7 +156,7 @@
     },
     "flake-utils": {
       "inputs": {
-        "systems": "systems"
+        "systems": "systems_2"
       },
       "locked": {
         "lastModified": 1692799911,
@@ -188,6 +208,28 @@
         "type": "github"
       }
     },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "deadnix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
     "nix-gaming": {
       "inputs": {
         "flake-parts": "flake-parts",
@@ -295,16 +337,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1699291058,
-        "narHash": "sha256-5ggduoaAMPHUy4riL+OrlAZE14Kh7JWX4oLEs22ZqfU=",
+        "lastModified": 1700538105,
+        "narHash": "sha256-uZhOCmwv8VupEmPZm3erbr9XXmyg7K67Ul3+Rx2XMe0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "41de143fda10e33be0f47eab2bfe08a50f234267",
+        "rev": "51a01a7e5515b469886c120e38db325c96694c2f",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.05",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -363,6 +405,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1699291058,
+        "narHash": "sha256-5ggduoaAMPHUy4riL+OrlAZE14Kh7JWX4oLEs22ZqfU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "41de143fda10e33be0f47eab2bfe08a50f234267",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nurpkgs": {
       "locked": {
         "lastModified": 1699509948,
@@ -403,6 +461,7 @@
     "root": {
       "inputs": {
         "aagl": "aagl",
+        "deadnix": "deadnix",
         "disko": "disko",
         "fenix": "fenix",
         "home-manager": "home-manager",
@@ -410,7 +469,7 @@
         "nix-gaming": "nix-gaming",
         "nixos-anywhere": "nixos-anywhere",
         "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_2",
         "nixpkgs-unfree": "nixpkgs-unfree",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "nurpkgs": "nurpkgs",
@@ -473,6 +532,21 @@
         "type": "github"
       }
     },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [
@@ -493,6 +567,24 @@
         "repo": "treefmt-nix",
         "type": "github"
       }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 98829006..a657c777 100644
--- a/flake.nix
+++ b/flake.nix
@@ -57,6 +57,7 @@
       url = "github:berberman/nvfetcher";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    deadnix.url = "github:astro/deadnix";
   };
 
   outputs = {
diff --git a/home-config/config/default.nix b/home-config/config/default.nix
index 13e51c36..b294f3f4 100644
--- a/home-config/config/default.nix
+++ b/home-config/config/default.nix
@@ -1,8 +1,4 @@
 {
-  config,
-  lib,
-  ...
-}: {
   imports = [
     ./options.nix
     ./non-nixos.nix
diff --git a/home-config/config/desktop/default.nix b/home-config/config/desktop/default.nix
index c44196be..155bb7f3 100644
--- a/home-config/config/desktop/default.nix
+++ b/home-config/config/desktop/default.nix
@@ -1,5 +1,4 @@
 {
-  pkgs,
   config,
   lib,
   ...
diff --git a/home-config/config/desktop/dunst.nix b/home-config/config/desktop/dunst.nix
index 6a66a4e6..59e2bff7 100644
--- a/home-config/config/desktop/dunst.nix
+++ b/home-config/config/desktop/dunst.nix
@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }: let
   screenHeight = 1080;
diff --git a/home-config/config/options.nix b/home-config/config/options.nix
index 35d3a8dc..0e9dd552 100644
--- a/home-config/config/options.nix
+++ b/home-config/config/options.nix
@@ -1,10 +1,5 @@
-{
-  config,
-  lib,
-  ...
-}: let
+{lib, ...}: let
   inherit (lib) mkEnableOption;
-  cfg = config.custom;
 in {
   options.custom = {
     desktop-environment = mkEnableOption "Set up a stumpwm-based desktop environment";
diff --git a/home-config/config/tty-applications/default.nix b/home-config/config/tty-applications/default.nix
index 2975263a..69abd385 100644
--- a/home-config/config/tty-applications/default.nix
+++ b/home-config/config/tty-applications/default.nix
@@ -1,8 +1,6 @@
 {
   config,
-  lib,
   pkgs,
-  flake-inputs,
   ...
 }: {
   imports = [
diff --git a/home-config/config/tty-applications/emacs.nix b/home-config/config/tty-applications/emacs.nix
index 3f072886..5a677ddd 100644
--- a/home-config/config/tty-applications/emacs.nix
+++ b/home-config/config/tty-applications/emacs.nix
@@ -1,5 +1,4 @@
 {
-  config,
   pkgs,
   flake-inputs,
   ...
diff --git a/home-config/default.nix b/home-config/default.nix
index 8f21dc16..a06c0655 100644
--- a/home-config/default.nix
+++ b/home-config/default.nix
@@ -1,6 +1,5 @@
 {
   lib,
-  pkgs,
   flake-inputs,
   ...
 }: {
diff --git a/home-modules/firefox-webapp.nix b/home-modules/firefox-webapp.nix
index 6e58e98b..f031aed4 100644
--- a/home-modules/firefox-webapp.nix
+++ b/home-modules/firefox-webapp.nix
@@ -1,5 +1,4 @@
 {
-  pkgs,
   config,
   lib,
   ...
diff --git a/nixos-config/default.nix b/nixos-config/default.nix
index e588b1b0..d22c34cb 100644
--- a/nixos-config/default.nix
+++ b/nixos-config/default.nix
@@ -1,6 +1,5 @@
 {
   lib,
-  config,
   pkgs,
   flake-inputs,
   ...
diff --git a/nixos-config/ren/default.nix b/nixos-config/ren/default.nix
index b6cf0eee..e8124959 100644
--- a/nixos-config/ren/default.nix
+++ b/nixos-config/ren/default.nix
@@ -1,8 +1,4 @@
-{
-  lib,
-  flake-inputs,
-  ...
-}: {
+{flake-inputs, ...}: {
   imports = [
     flake-inputs.impermanence.nixosModules.impermanence
     flake-inputs.disko.nixosModules.disko
diff --git a/nixos-config/yui/nvidia.nix b/nixos-config/yui/nvidia.nix
index 659ba2e2..7ef2f93a 100644
--- a/nixos-config/yui/nvidia.nix
+++ b/nixos-config/yui/nvidia.nix
@@ -64,7 +64,7 @@
   # Downgrade to 0.5.0 because 1.2.2 doesn't currently work on nvidia
   # (for me)
   xdg.portal.extraPortals = lib.mkOverride 49 [
-    (pkgs.xdg-desktop-portal-hyprland.overrideAttrs (old: {
+    (pkgs.xdg-desktop-portal-hyprland.overrideAttrs (_old: {
       version = "0.5.0";
       src = pkgs.fetchFromGitHub {
         owner = "hyprwm";
diff --git a/pkgs/applications/deepfilternet.nix b/pkgs/applications/deepfilternet.nix
index 04670962..a9de2451 100644
--- a/pkgs/applications/deepfilternet.nix
+++ b/pkgs/applications/deepfilternet.nix
@@ -21,7 +21,7 @@
       rustc = toolchain;
     };
 
-  hdf5-12 = hdf5.overrideAttrs (old: {
+  hdf5-12 = hdf5.overrideAttrs (_old: {
     version = "1.12.2";
 
     src = fetchurl {
diff --git a/pkgs/applications/emacs/default.nix b/pkgs/applications/emacs/default.nix
index 1a643624..9c9451b4 100644
--- a/pkgs/applications/emacs/default.nix
+++ b/pkgs/applications/emacs/default.nix
@@ -6,10 +6,7 @@
   emacsPackagesFor,
   emacsMacport,
   emacs,
-  runCommand,
   runCommandLocal,
-  fetchurl,
-  lzip,
 }: let
   emacsPlatform =
     if hostPlatform.isDarwin
@@ -25,7 +22,7 @@
     '';
   };
 
-  overrides = self: super: {
+  overrides = _self: super: {
     dashboard = super.dashboard.overrideAttrs (_old: {
       patches = [
         # See https://github.com/emacs-dashboard/emacs-dashboard/issues/81
@@ -37,7 +34,7 @@
   emacsPkgs = (emacsPackagesFor emacsPlatform).overrideScope' overrides;
 
   # Compute the list of use-package-d packages.
-  package-list = runCommand "package-list" {buildInputs = [emacsPkgs.emacs];} ''
+  package-list = runCommandLocal "package-list" {buildInputs = [emacsPkgs.emacs];} ''
     HOME=/tmp SCANNING_PACKAGES=true emacs --batch --quick \
           -L ${emacsPkgs.use-package}/share/emacs/site-lisp/elpa/use-package-* \
           -L ${emacsPkgs.bind-key}/share/emacs/site-lisp/elpa/bind-key-* \
@@ -54,7 +51,7 @@
     emacsPkgs.emacs.pkgs.withPackages
     (epkgs: map (package: builtins.getAttr package epkgs) required-packages);
 
-  compiled-dotfiles = runCommand "compiled-init" {buildInputs = [custom-emacs];} ''
+  compiled-dotfiles = runCommandLocal "compiled-init" {buildInputs = [custom-emacs];} ''
     cp -r '${self}/home-config/dotfiles/emacs.d/' "$out"
     chmod -R u+w "$out"
 
diff --git a/pkgs/configuration/phosphor-icons.nix b/pkgs/configuration/phosphor-icons.nix
index 4dd285a5..7f481758 100644
--- a/pkgs/configuration/phosphor-icons.nix
+++ b/pkgs/configuration/phosphor-icons.nix
@@ -1,8 +1,6 @@
 {
-  lib,
   sources,
   stdenv,
-  fetchFromGitHub,
 }:
 stdenv.mkDerivation {
   inherit (sources.phosphor-icons) pname version src;