diff --git a/devenv.nix b/devenv.nix
index fc5c50b..a736435 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -1,24 +1,10 @@
-{ pkgs
-, lib
-, config
-, inputs
-, ...
-}:
+{ pkgs, lib, config, inputs, ... }:
 
-let
-  req = pkgs.concatText "req" [
-    ./requirements.txt
-    ./requirements-dev.txt
-  ];
-in
+let req = pkgs.concatText "req" [ ./requirements.txt ./requirements-dev.txt ];
 
-{
+in {
   # https://devenv.sh/packages/
-  packages = [
-    pkgs.file
-    pkgs.swig4
-    pkgs.openssl
-  ];
+  packages = [ pkgs.file pkgs.swig4 pkgs.openssl ];
 
   # https://devenv.sh/tests/
   # enterTest = ''
@@ -41,7 +27,7 @@ in
 
   # https://devenv.sh/pre-commit-hooks/
   pre-commit.hooks = {
-    nixpkgs-fmt.enable = true;
+    nixfmt.enable = true;
     # remove unused imports
     autoflake.enable = true;
     # formatter
diff --git a/flake.nix b/flake.nix
index 3620b7c..113008d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,31 +7,14 @@
     pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
   };
 
-  outputs =
-    { self
-    , nixpkgs
-    , flake-utils
-    , pre-commit-hooks
-    ,
-    }:
-    let
-      supportedSystems = [
-        "x86_64-linux"
-        "aarch64-darwin"
-      ];
-    in
-    {
+  outputs = { self, nixpkgs, flake-utils, pre-commit-hooks, }:
+    let supportedSystems = [ "x86_64-linux" "aarch64-darwin" ];
+    in {
       overlays.default = import ./overlay.nix { inherit self; };
-    }
-    // flake-utils.lib.eachSystem supportedSystems (
-      system:
-      let
-        pkgs = import nixpkgs { inherit system; };
-      in
-      {
-        packages = {
-          smtprd-ng = pkgs.callPackage ./. { };
-        };
+    } // flake-utils.lib.eachSystem supportedSystems (system:
+      let pkgs = import nixpkgs { inherit system; };
+      in {
+        packages = { smtprd-ng = pkgs.callPackage ./. { }; };
 
         packages.default = self.packages.${system}.smtprd-ng;
 
@@ -39,12 +22,13 @@
           pre-commit-check = pre-commit-hooks.lib.${system}.run rec {
             src = ./.;
             hooks = {
-              nixpkgs-fmt.enable = true;
+              nixfmt.enable = true;
               autoflake.enable = true;
               black.enable = true;
               isort.enable = true;
               isort.settings.flags = "--profile black";
-              pylint.enable = false; # doesn't work correctly with module imports in flake
+              pylint.enable =
+                false; # doesn't work correctly with module imports in flake
               detect-private-keys.enable = true;
               detect-private-keys.excludes = [ "tests/" ];
             };
@@ -56,6 +40,5 @@
           type = "app";
           program = "${self.packages.${system}.smtprd-ng}/bin/smtprd-ng";
         };
-      }
-    );
+      });
 }