diff --git a/flake.nix b/flake.nix
index 782057c..26ff251 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,37 +5,40 @@
     nixpkgs.url = github:nixos/nixpkgs/nixos-23.05;
   };
 
-  outputs = { self, nixpkgs }:
-    let
-      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
-      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-      pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
-    in {
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
+  in {
+    # Formatter
+    formatter = forAllSystems (system: nixpkgs.legacyPackages.${system}.alejandra);
 
-      # Packages
-      packages = forAllSystems (system: {
-        default = pkgs.${system}.poetry2nix.mkPoetryApplication { projectDir = self; };
-      });
+    # Packages
+    packages = forAllSystems (system: {
+      default = pkgs.${system}.poetry2nix.mkPoetryApplication {projectDir = self;};
+    });
 
-      # Dev Shell
-      devShells = forAllSystems (system: {
-        default = pkgs.${system}.mkShellNoCC {
-          shellHook = "Welcome to your nix-powered dev environment for dyn-gandi!";
+    # Dev Shell
+    devShells = forAllSystems (system: {
+      default = pkgs.${system}.mkShellNoCC {
+        shellHook = "Welcome to your nix-powered dev environment for dyn-gandi!";
 
-          packages = with pkgs.${system}; [
-            (poetry2nix.mkPoetryEnv { projectDir = self; })
-            poetry
-          ];
+        packages = with pkgs.${system}; [
+          (poetry2nix.mkPoetryEnv {projectDir = self;})
+          poetry
+        ];
+      };
+    });
 
-        };
-      });
-
-      # Run as apps
-      apps = forAllSystems (system: {
-        default = {
-          program = "${self.packages.${system}.default}/bin/dyn_gandi";
-          type = "app";
-        };
-      });
-    };
+    # Run as apps
+    apps = forAllSystems (system: {
+      default = {
+        program = "${self.packages.${system}.default}/bin/dyn_gandi";
+        type = "app";
+      };
+    });
+  };
 }