diff --git a/flake.nix b/flake.nix
index 891c36e..8186624 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,8 +23,6 @@
           inputs',
           self',
           pkgs,
-          lib,
-          system,
           ...
         }:
         {
@@ -51,7 +49,12 @@
             };
           };
 
-          formatter = pkgs.nixfmt-rfc-style;
+          treefmt = {
+            programs.deadnix.enable = true;
+            programs.nixfmt.enable = true;
+            programs.statix.enable = true;
+            programs.fish_indent.enable = true;
+          };
         };
     };
 
diff --git a/hosts/hijiri-vm/default.nix b/hosts/hijiri-vm/default.nix
index c1a6366..db26c63 100644
--- a/hosts/hijiri-vm/default.nix
+++ b/hosts/hijiri-vm/default.nix
@@ -3,7 +3,6 @@
     {
       modulesPath,
       lib,
-      username,
       ...
     }:
     {
diff --git a/hosts/kazuki/default.nix b/hosts/kazuki/default.nix
index e7cdeb1..77f3e3c 100644
--- a/hosts/kazuki/default.nix
+++ b/hosts/kazuki/default.nix
@@ -1,9 +1,7 @@
 {
   configurations.nixos.kazuki =
     {
-      config,
       modulesPath,
-      lib,
       ...
     }:
     {
diff --git a/hosts/kogata/default.nix b/hosts/kogata/default.nix
index 6a4a68a..8055240 100644
--- a/hosts/kogata/default.nix
+++ b/hosts/kogata/default.nix
@@ -1,6 +1,6 @@
 {
   configurations.darwin.kogata =
-    { pkgs, lib, ... }:
+    { pkgs, ... }:
     {
       nixpkgs.system = "aarch64-darwin";
 
diff --git a/hosts/legion/default.nix b/hosts/legion/default.nix
index 4c879d2..d293523 100644
--- a/hosts/legion/default.nix
+++ b/hosts/legion/default.nix
@@ -2,7 +2,6 @@
   configurations.nixos.legion =
     {
       config,
-      lib,
       username,
       ...
     }:
diff --git a/hosts/legion/disks.nix b/hosts/legion/disks.nix
index 55f4317..74ecef9 100644
--- a/hosts/legion/disks.nix
+++ b/hosts/legion/disks.nix
@@ -1,4 +1,4 @@
-args:
+_args:
 /*
   let
     bootDevice = args.bootDevice or "/dev/nvme0n1";
diff --git a/modules/flake/configurations.nix b/modules/flake/configurations.nix
index b5ab71b..67ccc1b 100644
--- a/modules/flake/configurations.nix
+++ b/modules/flake/configurations.nix
@@ -6,7 +6,6 @@
 {
   config,
   lib,
-  flake-parts-lib,
   ...
 }:
 with lib;
diff --git a/modules/system/common/github-runner.nix b/modules/system/common/github-runner.nix
index 549630a..5af703e 100644
--- a/modules/system/common/github-runner.nix
+++ b/modules/system/common/github-runner.nix
@@ -2,7 +2,6 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }:
 let
diff --git a/modules/system/common/hercules.nix b/modules/system/common/hercules.nix
index dd5b5f2..9762094 100644
--- a/modules/system/common/hercules.nix
+++ b/modules/system/common/hercules.nix
@@ -1,7 +1,6 @@
 { isLinux }:
 {
   config,
-  pkgs,
   lib,
   ...
 }:
diff --git a/modules/system/common/incus.nix b/modules/system/common/incus.nix
index e43d967..6a0ee35 100644
--- a/modules/system/common/incus.nix
+++ b/modules/system/common/incus.nix
@@ -4,7 +4,6 @@
   config,
   pkgs,
   username,
-  inputs',
   ...
 }:
 let
diff --git a/modules/system/settei/default.nix b/modules/system/settei/default.nix
index 30493f5..e554482 100644
--- a/modules/system/settei/default.nix
+++ b/modules/system/settei/default.nix
@@ -5,8 +5,6 @@
 }:
 {
   lib,
-  pkgs,
-  config,
   options,
   ...
 }: