diff --git a/package.nix b/default.nix
similarity index 67%
rename from package.nix
rename to default.nix
index be9151b..4341ced 100644
--- a/package.nix
+++ b/default.nix
@@ -6,7 +6,7 @@ pkgs.buildGoModule rec {
 
   src = ./.;
 
-  vendorHash = "sha256-TK2Fc4bTkiSpyYrg4dJOzamEnii03P7kyHZdah9izqY=";
+  vendorHash = null;
 
   ldflags = [ "-s" "-w" "-X=main.Version=${version}" ];
 }
diff --git a/flake.lock b/flake.lock
index 5a799b0..69125b4 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,23 +1,5 @@
 {
   "nodes": {
-    "flake-utils": {
-      "inputs": {
-        "systems": "systems"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1768564909,
@@ -36,24 +18,8 @@
     },
     "root": {
       "inputs": {
-        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
-    },
-    "systems": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 0d1f446..df15ee7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,20 +1,73 @@
 {
-  description = "A Simple Campfire bot";
+  description = "A simple Go package";
 
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-  };
+  # Nixpkgs / NixOS version to use.
+  # inputs.nixpkgs.url = "nixpkgs/nixos-21.11";
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
 
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem
-      (system:
-        let pkgs = import nixpkgs { inherit system; }; in
-        rec {
-          packages.default = import ./default.nix { inherit pkgs; };
-        }) // {
-      overlays.default = final: prev: {
-        sox = import ./default.nix { pkgs = final; };
-      };
+
+  outputs = { self, nixpkgs }:
+    let
+
+      # to work with older version of flakes
+      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" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          sox = pkgs.buildGoModule {
+            pname = "sox";
+            inherit version;
+            # In 'nix develop', we don't need a copy of the source tree
+            # in the Nix store.
+            src = ./.;
+
+            # This hash locks the dependencies of this package. It is
+            # necessary because of how Go requires network access to resolve
+            # VCS.  See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
+            # details. Normally one can build with a fake hash and rely on native Go
+            # mechanisms to tell you what the hash should be or determine what
+            # it should be "out-of-band" with other tooling (eg. gomod2nix).
+            # To begin with it is recommended to set this, but one must
+            # remember to bump this hash when your dependencies change.
+            # vendorHash = pkgs.lib.fakeHash;
+
+            vendorHash = null;
+          };
+        });
+
+      # Add dependencies that are only needed for development
+      devShells = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [ go gopls gotools go-tools ];
+          };
+        });
+
+      # 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}.sox);
     };
 }
diff --git a/main.go b/main.go
index c968bed..8b9bf71 100644
--- a/main.go
+++ b/main.go
@@ -34,6 +34,7 @@ type BotMessage struct {
 }
 
 func main() {
+	fmt.Println("Sox started")
 	http.HandleFunc("/", commandHandler)
 
 	port := os.Getenv("PORT")