diff --git a/flake.nix b/flake.nix
index d6f0af0..faaab14 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,44 +1,60 @@
 {
   description = "GitHub Pages";
 
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz"; # nixos-unstable
+  inputs = {
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz"; # nixos-unstable
 
-  inputs.ruby-nix = {
-    url = "github:inscapist/ruby-nix";
-    inputs.nixpkgs.follows = "nixpkgs";
-  };
+    ruby-nix = {
+      url = "github:inscapist/ruby-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
 
-  inputs.bundix = {
-    url = "github:inscapist/bundix/main";
-    inputs.nixpkgs.follows = "nixpkgs";
-  };
+    bundix = {
+      url = "github:inscapist/bundix/main";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
 
-  inputs.flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/0.1.*.tar.gz";
+    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/0.1.*.tar.gz";
+  };
 
-  outputs = { self, nixpkgs, ruby-nix, bundix, flake-schemas }:
+  outputs =
+    {
+      self,
+      nixpkgs,
+      ruby-nix,
+      bundix,
+      flake-schemas,
+    }:
     let
       allSystems = [
         "x86_64-linux"
         "aarch64-darwin"
       ];
 
-      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
-        # Current 'ruby' package version: 3.3.4
-        # Should match https://github.com/actions/jekyll-build-pages/blob/v1.0.13/Dockerfile
-        pkgs = import nixpkgs { inherit system; };
-      });
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs allSystems (
+          system:
+          f {
+            # Current 'ruby' package version: 3.3.4
+            # Should match https://github.com/actions/jekyll-build-pages/blob/v1.0.13/Dockerfile
+            pkgs = nixpkgs.legacyPackages.${system};
+          }
+        );
     in
     {
       inherit (flake-schemas) schemas;
 
-      formatter = forAllSystems ({ pkgs }: pkgs.nixpkgs-fmt);
+      formatter = forAllSystems ({ pkgs }: pkgs.nixfmt-rfc-style);
 
-      devShells = forAllSystems ({ pkgs }:
+      devShells = forAllSystems (
+        { pkgs }:
         let
-          ruby-env = (ruby-nix.lib pkgs {
-            name = "github-pages";
-            gemset = ./gemset.nix;
-          }).env;
+          ruby-env =
+            (ruby-nix.lib pkgs {
+              name = "github-pages";
+              gemset = ./gemset.nix;
+            }).env;
 
           bundix-cli = bundix.packages.${pkgs.system}.default;