diff --git a/.vscode/settings.json b/.vscode/settings.json
index 8dbba70..e5a6ac6 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -9,7 +9,7 @@
   "nix.serverSettings": {
     "nil": {
       "formatting": {
-        "command": ["nixpkgs-fmt"]
+        "command": ["nixfmt"]
       }
     }
   }
diff --git a/Taskfile.yml b/Taskfile.yml
index f260105..8184e12 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -24,7 +24,7 @@ tasks:
       - dprint check
       - typos . .github .vscode
       # nix fmt doesn't have check: https://github.com/NixOS/nix/issues/6918
-      - nixpkgs-fmt --check ./*.nix
+      - nixfmt --check ./*.nix
   deps:
     cmds:
       - nix --version
diff --git a/flake.nix b/flake.nix
index 8b41f11..d6b439f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,11 +11,14 @@
 
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
-      let
-        pkgs = nixpkgs.legacyPackages.${system};
-      in
-      {
-        formatter = pkgs.nixpkgs-fmt;
+      let pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        # Q. Why nixfmt? Not nixpkgs-fmt and alejandra?
+        # A. nixfmt will be official
+        # - https://github.com/NixOS/nixfmt/issues/153
+        # - https://github.com/NixOS/nixfmt/issues/129
+        # - https://github.com/NixOS/rfcs/pull/166
+        formatter = pkgs.nixfmt;
         devShells.default = with pkgs;
           mkShell {
             buildInputs = [
@@ -23,13 +26,12 @@
               # https://github.com/kachick/dotfiles/pull/228
               bashInteractive
 
+              nixfmt
               nil
-              nixpkgs-fmt
               dprint
               typos
               go-task
             ];
           };
-      }
-    );
+      });
 }