diff --git a/flake.nix b/flake.nix
index 01178db..70ccc9f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
   description = "an offline-capable xkcd webcomic reader written in Go";
 
-  inputs= {
+  inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-compat = {
       url = "github:edolstra/flake-compat";
@@ -14,13 +14,15 @@
     let
 
       # to work with older version of flakes
-      lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
+      lastModifiedDate =
+        self.lastModifiedDate or self.lastModified or "19700101";
 
       # Generate a user-friendly version number.
       version = builtins.substring 0 8 lastModifiedDate;
 
       # System types to support.
-      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      supportedSystems =
+        [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
 
       # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
       forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
@@ -33,9 +35,9 @@
 
       # Provide some binary packages for selected system types.
       packages = forAllSystems (system:
-        let
-          pkgs = nixpkgsFor.${system};
-        in rec {
+        let pkgs = nixpkgsFor.${system};
+        in
+        rec {
           go-xkcdreader = pkgs.buildGoModule {
             pname = "go-xkcdreader";
             inherit version;
@@ -53,33 +55,31 @@
             # remeber to bump this hash when your dependencies change.
             #vendorSha256 = pkgs.lib.fakeSha256;
 
-            vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+            vendorSha256 =
+              "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
           };
         });
 
       # The default package for 'nix build'. This makes sense if the
       # flake provides only one package or there is a clear "main"
       # package.
-      defaultPackage = forAllSystems (system: self.packages.${system}.go-xkcdreader);
+      defaultPackage =
+        forAllSystems (system: self.packages.${system}.go-xkcdreader);
 
       apps = forAllSystems (system: rec {
         go-xkcdreader = {
           type = "app";
-          program = "${self.packages.${system}.go-xkcdreader}/bin/go-xkcdreader";
+          program =
+            "${self.packages.${system}.go-xkcdreader}/bin/go-xkcdreader";
         };
         default = go-xkcdreader;
       });
 
-      devShells= forAllSystems (system:
+      devShells = forAllSystems (system:
         let pkgs = nixpkgsFor.${system};
-        in pkgs.mkShell {
-          buildInputs = with pkgs; [
-            go
-            gopls
-            gofumpt
-            go-tools
-          ];
-        }
-      );
+        in
+        pkgs.mkShell {
+          buildInputs = with pkgs; [ go gopls gofumpt go-tools nixpkgs-fmt ];
+        });
     };
 }