diff --git a/apple/macbook-pro/10-1/default.nix b/apple/macbook-pro/10-1/default.nix
index 8967b1c..660f648 100644
--- a/apple/macbook-pro/10-1/default.nix
+++ b/apple/macbook-pro/10-1/default.nix
@@ -4,7 +4,6 @@
   imports = [
     ../.
     ../../../common/pc/ssd
-    ../../../common/gpu/24.05-compat.nix
     ../../../common/gpu/nvidia/kepler
   ];
 
diff --git a/apple/macmini/4/default.nix b/apple/macmini/4/default.nix
index fd6d9c9..86210c4 100644
--- a/apple/macmini/4/default.nix
+++ b/apple/macmini/4/default.nix
@@ -8,7 +8,6 @@ in
 {
   imports = [
     ../.
-    ../../../common/gpu/24.05-compat.nix
   ];
 
   services.xserver.videoDrivers = mkDefault [ "nvidiaLegacy340" ];
diff --git a/apple/t2/default.nix b/apple/t2/default.nix
index 825a181..6dc9254 100644
--- a/apple/t2/default.nix
+++ b/apple/t2/default.nix
@@ -7,7 +7,6 @@
 
 let
   inherit (lib) types;
-  nixosVersion = lib.versions.majorMinor lib.version;
 
   audioFiles = pkgs.fetchFromGitHub {
     owner = "kekrby";
@@ -106,16 +105,9 @@ in
       powerManagement.enable = true;
     }
 
-    (
-      if lib.versionAtLeast nixosVersion "25.05" then
-        {
-          services.pulseaudio.package = overrideAudioFiles pkgs.pulseaudio "src/modules/";
-        }
-      else
-        {
-          hardware.pulseaudio.package = overrideAudioFiles pkgs.pulseaudio "src/modules/";
-        }
-    )
+    {
+      services.pulseaudio.package = overrideAudioFiles pkgs.pulseaudio "src/modules/";
+    }
 
     (lib.mkIf t2Cfg.enableIGPU {
       # Enable the iGPU by default if present
diff --git a/asus/zephyrus/ga402x/shared.nix b/asus/zephyrus/ga402x/shared.nix
index bd0eda3..36b39dd 100644
--- a/asus/zephyrus/ga402x/shared.nix
+++ b/asus/zephyrus/ga402x/shared.nix
@@ -1,6 +1,5 @@
 {
   config,
-  pkgs,
   lib,
   ...
 }:
@@ -11,9 +10,7 @@ let
     mkEnableOption
     mkIf
     mkMerge
-    version
     versionAtLeast
-    versionOlder
     ;
 
   cfg = config.hardware.asus.zephyrus.ga402x;
@@ -94,12 +91,6 @@ in
       '';
     })
 
-    (mkIf (versionOlder version "23.11") {
-      # See https://asus-linux.org/wiki/nixos/ for info about some problems
-      # detecting the dGPU:
-      systemd.services.supergfxd.path = [ pkgs.pciutils ];
-    })
-
     (mkIf (config.networking.wireless.iwd.enable && config.networking.wireless.scanOnLowSignal) {
       # Meditek doesn't seem to be quite sensitive enough on the default roaming settings:
       #   https://wiki.archlinux.org/title/Wpa_supplicant#Roaming
diff --git a/common/gpu/24.05-compat.nix b/common/gpu/24.05-compat.nix
deleted file mode 100644
index bcccd2c..0000000
--- a/common/gpu/24.05-compat.nix
+++ /dev/null
@@ -1,24 +0,0 @@
-{
-  lib,
-  ...
-}:
-{
-  # Backward-compat for 24.05, can be removed after we drop 24.05 support
-  imports = lib.optionals (lib.versionOlder lib.version "24.11pre") [
-    (lib.mkAliasOptionModule [ "hardware" "graphics" "enable" ] [ "hardware" "opengl" "enable" ])
-    (lib.mkAliasOptionModule
-      [ "hardware" "graphics" "extraPackages" ]
-      [ "hardware" "opengl" "extraPackages" ]
-    )
-    (lib.mkAliasOptionModule
-      [ "hardware" "graphics" "extraPackages32" ]
-      [ "hardware" "opengl" "extraPackages32" ]
-    )
-    (lib.mkAliasOptionModule
-      [ "hardware" "graphics" "enable32Bit" ]
-      [ "hardware" "opengl" "driSupport32Bit" ]
-    )
-    (lib.mkAliasOptionModule [ "hardware" "graphics" "package" ] [ "hardware" "opengl" "package" ])
-    (lib.mkAliasOptionModule [ "hardware" "graphics" "package32" ] [ "hardware" "opengl" "package32" ])
-  ];
-}
diff --git a/common/gpu/amd/default.nix b/common/gpu/amd/default.nix
index 5373004..f6903d9 100644
--- a/common/gpu/amd/default.nix
+++ b/common/gpu/amd/default.nix
@@ -1,7 +1,6 @@
 { lib, ... }:
 
 {
-  imports = [ ../24.05-compat.nix ];
   config = {
     services.xserver.videoDrivers = lib.mkDefault [ "modesetting" ];
 
diff --git a/common/gpu/intel/default.nix b/common/gpu/intel/default.nix
index 0c5e346..51a8cfc 100644
--- a/common/gpu/intel/default.nix
+++ b/common/gpu/intel/default.nix
@@ -5,8 +5,6 @@
   ...
 }:
 {
-  imports = [ ../24.05-compat.nix ];
-
   options.hardware.intelgpu = {
     driver = lib.mkOption {
       description = "Intel GPU driver to use";
diff --git a/common/gpu/nvidia/default.nix b/common/gpu/nvidia/default.nix
index 281e33f..2f58353 100644
--- a/common/gpu/nvidia/default.nix
+++ b/common/gpu/nvidia/default.nix
@@ -1,6 +1,5 @@
 { lib, ... }:
 
 {
-  imports = [ ../24.05-compat.nix ];
   services.xserver.videoDrivers = lib.mkDefault [ "nvidia" ];
 }
diff --git a/common/pc/laptop/default.nix b/common/pc/laptop/default.nix
index abc76fa..5711e53 100644
--- a/common/pc/laptop/default.nix
+++ b/common/pc/laptop/default.nix
@@ -3,11 +3,5 @@
 {
   imports = [ ../. ];
 
-  # Gnome 40 introduced a new way of managing power, without tlp.
-  # However, these 2 services clash when enabled simultaneously.
-  # https://github.com/NixOS/nixos-hardware/issues/260
-  services.tlp.enable = lib.mkDefault (
-    (lib.versionOlder (lib.versions.majorMinor lib.version) "21.05")
-    || !config.services.power-profiles-daemon.enable
-  );
+  services.tlp.enable = lib.mkDefault (!config.services.power-profiles-daemon.enable);
 }
diff --git a/dell/precision/5570/default.nix b/dell/precision/5570/default.nix
index 903cce6..563ef68 100644
--- a/dell/precision/5570/default.nix
+++ b/dell/precision/5570/default.nix
@@ -30,7 +30,7 @@
 
   # Override the Intel gpu driver setting imported above
   environment.variables = {
-    VDPAU_DRIVER = lib.mkIf config.hardware.opengl.enable (lib.mkOverride 990 "nvidia");
+    VDPAU_DRIVER = lib.mkIf config.hardware.graphics.enable (lib.mkOverride 990 "nvidia");
   };
 
   services.thermald.enable = lib.mkDefault true;
diff --git a/gpd/pocket-3/default.nix b/gpd/pocket-3/default.nix
index 6b19d0a..964b186 100644
--- a/gpd/pocket-3/default.nix
+++ b/gpd/pocket-3/default.nix
@@ -1,13 +1,12 @@
 { lib, pkgs, ... }:
 let
-  inherit (lib) mkDefault mkIf;
+  inherit (lib) mkDefault;
 in
 {
   imports = [
     ../../common/pc/laptop
     ../../common/pc/ssd
     ../../common/hidpi.nix
-    ../../common/gpu/24.05-compat.nix
   ];
 
   # Necessary kernel modules
@@ -22,12 +21,7 @@ in
   boot.initrd.kernelModules = [ "i915" ]; # Early loading so the passphrase prompt appears on external displays
   hardware.graphics.extraPackages = with pkgs; [
     intel-media-driver
-    (
-      if (lib.versionOlder (lib.versions.majorMinor lib.version) "23.11") then
-        vaapiIntel
-      else
-        intel-vaapi-driver
-    )
+    intel-vaapi-driver
   ];
 
   boot.kernelParams = [
@@ -46,7 +40,6 @@ in
     # Per the documentation, antialiasing, hinting, etc. have no visible effect at such high pixel densities anyhow.
     # Set manually, as the hiDPI module had incorrect settings prior to NixOS 22.11; see nixpkgs#194594.
     hinting.enable = mkDefault false;
-    antialias = mkIf (lib.versionOlder (lib.versions.majorMinor lib.version) "22.11") false;
   };
 
   # More HiDPI settings
diff --git a/gpd/win-2/default.nix b/gpd/win-2/default.nix
index e724753..c281789 100644
--- a/gpd/win-2/default.nix
+++ b/gpd/win-2/default.nix
@@ -10,10 +10,7 @@
     "video=eDP-1:panel_orientation=right_side_up"
   ];
 
-  services.tlp.enable = lib.mkDefault (
-    (lib.versionOlder (lib.versions.majorMinor lib.version) "21.05")
-    || !config.services.power-profiles-daemon.enable
-  );
+  services.tlp.enable = lib.mkDefault (!config.services.power-profiles-daemon.enable);
 
   # Required for grub to properly display the boot menu.
   boot.loader.grub.gfxmodeEfi = lib.mkDefault "720x1280x32";
diff --git a/hardkernel/odroid-hc4/default.nix b/hardkernel/odroid-hc4/default.nix
index a6442ab..aad0eb7 100644
--- a/hardkernel/odroid-hc4/default.nix
+++ b/hardkernel/odroid-hc4/default.nix
@@ -32,7 +32,7 @@
   };
 
   # Linux 5.15 sometimes crash under heavy network usage
-  systemd.watchdog.runtimeTime = lib.mkDefault "1min";
+  systemd.settings.Manager.RuntimeWatchdogSec = lib.mkDefault "1min";
 
   hardware.deviceTree.filter = "meson-sm1-odroid-hc4.dtb";
 }
diff --git a/lenovo/thinkpad/p1/3th-gen/nvidia.nix b/lenovo/thinkpad/p1/3th-gen/nvidia.nix
index ae19167..6f939e9 100644
--- a/lenovo/thinkpad/p1/3th-gen/nvidia.nix
+++ b/lenovo/thinkpad/p1/3th-gen/nvidia.nix
@@ -1,8 +1,5 @@
 { lib, ... }:
 {
-  imports = [
-    ../../../../common/gpu/24.05-compat.nix
-  ];
   hardware = {
     graphics = {
       enable = lib.mkDefault true;
diff --git a/lenovo/thinkpad/p51/default.nix b/lenovo/thinkpad/p51/default.nix
index da133e4..a286f48 100644
--- a/lenovo/thinkpad/p51/default.nix
+++ b/lenovo/thinkpad/p51/default.nix
@@ -1,7 +1,6 @@
 { config, lib, ... }:
 {
   imports = [
-    ../../../common/gpu/24.05-compat.nix
     ../../../common/gpu/nvidia/prime.nix
     ../../../common/gpu/nvidia/maxwell
     ../../../common/cpu/intel/kaby-lake
diff --git a/lenovo/thinkpad/p52/default.nix b/lenovo/thinkpad/p52/default.nix
index fc8811f..c8b2db4 100644
--- a/lenovo/thinkpad/p52/default.nix
+++ b/lenovo/thinkpad/p52/default.nix
@@ -1,7 +1,6 @@
 { lib, config, ... }:
 {
   imports = [
-    ../../../common/gpu/24.05-compat.nix
     ../../../common/gpu/nvidia/prime.nix
     ../../../common/gpu/nvidia/pascal
     ../../../common/cpu/intel
diff --git a/lenovo/thinkpad/x13s/default.nix b/lenovo/thinkpad/x13s/default.nix
index 59cf01b..0b2ffe8 100644
--- a/lenovo/thinkpad/x13s/default.nix
+++ b/lenovo/thinkpad/x13s/default.nix
@@ -78,7 +78,7 @@ in
   };
 
   # https://github.com/jhovold/linux/wiki/X13s#modem
-  networking.networkmanager.fccUnlockScripts = [
+  networking.modemmanager.fccUnlockScripts = [
 
     {
       id = "105b:e0c3";
diff --git a/lenovo/thinkpad/z/gen2/z13/default.nix b/lenovo/thinkpad/z/gen2/z13/default.nix
index 2f68821..9423256 100644
--- a/lenovo/thinkpad/z/gen2/z13/default.nix
+++ b/lenovo/thinkpad/z/gen2/z13/default.nix
@@ -1,4 +1,4 @@
-{ pkgs, lib, ... }:
+{ pkgs, ... }:
 
 {
   imports = [
@@ -14,8 +14,7 @@
         path = "${pkgs.modemmanager}/share/ModemManager/fcc-unlock.available.d/${id}";
       };
     in
-    if lib.versionOlder lib.version "25.05pre" then
-      { networkmanager.fccUnlockScripts = [ fcc_unlock_script ]; }
-    else
-      { modemmanager.fccUnlockScripts = [ fcc_unlock_script ]; };
+    {
+      modemmanager.fccUnlockScripts = [ fcc_unlock_script ];
+    };
 }
diff --git a/purism/librem/5r4/audio.nix b/purism/librem/5r4/audio.nix
index 9c49fa7..2ca23d4 100644
--- a/purism/librem/5r4/audio.nix
+++ b/purism/librem/5r4/audio.nix
@@ -19,25 +19,14 @@
           '';
         };
       in
-      if lib.versionOlder (lib.versions.majorMinor lib.version) "25.05" then
-        {
-          assertions = [
-            {
-              assertion = config.hardware.pulseaudio.enable;
-              message = "Call audio on Librem5 requires pulse audio to be enabled through `hardware.pulseaudio.enable`.";
-            }
-          ];
-          hardware.pulseaudio = paConfig;
-        }
-      else
-        {
-          assertions = [
-            {
-              assertion = config.services.pulseaudio.enable;
-              message = "Call audio on Librem5 requires pulse audio to be enabled through `services.pulseaudio.enable`.";
-            }
-          ];
-          services.pulseaudio = paConfig;
-        }
+      {
+        assertions = [
+          {
+            assertion = config.services.pulseaudio.enable;
+            message = "Call audio on Librem5 requires pulse audio to be enabled through `services.pulseaudio.enable`.";
+          }
+        ];
+        services.pulseaudio = paConfig;
+      }
     );
 }
diff --git a/tests/flake.lock b/tests/flake.lock
index 558576b..27e69dd 100644
--- a/tests/flake.lock
+++ b/tests/flake.lock
@@ -2,16 +2,16 @@
   "nodes": {
     "nixos-stable": {
       "locked": {
-        "lastModified": 1761597516,
-        "narHash": "sha256-wxX7u6D2rpkJLWkZ2E932SIvDJW8+ON/0Yy8+a5vsDU=",
+        "lastModified": 1767799921,
+        "narHash": "sha256-r4GVX+FToWVE2My8VVZH4V0pTIpnu2ZE8/Z4uxGEMBE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "daf6dc47aa4b44791372d6139ab7b25269184d55",
+        "rev": "d351d0653aeb7877273920cd3e823994e7579b0b",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.05",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/tests/flake.nix b/tests/flake.nix
index 242c07b..1d192b9 100644
--- a/tests/flake.nix
+++ b/tests/flake.nix
@@ -3,7 +3,7 @@
 
   inputs = {
     nixos-unstable-small.url = "github:NixOS/nixpkgs/nixos-unstable-small";
-    nixos-stable.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixos-stable.url = "github:NixOS/nixpkgs/nixos-25.11";
     treefmt-nix.url = "github:numtide/treefmt-nix";
     treefmt-nix.inputs.nixpkgs.follows = "nixos-unstable-small";
   };
diff --git a/tuxedo/aura/15/gen1/default.nix b/tuxedo/aura/15/gen1/default.nix
index 6c4b5da..416a687 100644
--- a/tuxedo/aura/15/gen1/default.nix
+++ b/tuxedo/aura/15/gen1/default.nix
@@ -10,13 +10,5 @@
   services.thermald.enable = lib.mkDefault true;
 
   # keyboard backlight lives in /sys/class/leds/rgb:kbd_backlight
-  hardware =
-    if lib.versionAtLeast (lib.versions.majorMinor lib.version) "24.11" then
-      {
-        tuxedo-drivers.enable = lib.mkDefault true;
-      }
-    else
-      {
-        tuxedo-keyboard.enable = lib.mkDefault true;
-      };
+  hardware.tuxedo-drivers.enable = lib.mkDefault true;
 }