diff --git a/elixir/flake.lock b/elixir/flake.lock
index 1cbfc64..f694c77 100644
--- a/elixir/flake.lock
+++ b/elixir/flake.lock
@@ -1,13 +1,31 @@
 {
   "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1712963716,
-        "narHash": "sha256-WKm9CvgCldeIVvRz87iOMi8CFVB1apJlkUT4GGvA0iM=",
-        "rev": "cfd6b5fc90b15709b780a5a1619695a88505a176",
-        "revCount": 611350,
+        "lastModified": 1719075281,
+        "narHash": "sha256-CyyxvOwFf12I91PBWz43iGT1kjsf5oi6ax7CrvaMyAo=",
+        "rev": "a71e967ef3694799d0c418c98332f7ff4cc5f6af",
+        "revCount": 642660,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.611350%2Brev-cfd6b5fc90b15709b780a5a1619695a88505a176/018eddfc-e6d9-74bb-a823-20f2ae60079b/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.642660%2Brev-a71e967ef3694799d0c418c98332f7ff4cc5f6af/0190462b-ab23-7472-8ae7-ae4f8bde47d9/source.tar.gz"
       },
       "original": {
         "type": "tarball",
@@ -16,8 +34,24 @@
     },
     "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/elixir/flake.nix b/elixir/flake.nix
index 951c4ce..6b248cd 100644
--- a/elixir/flake.nix
+++ b/elixir/flake.nix
@@ -1,27 +1,100 @@
 {
   description = "A Nix-flake-based Elixir development environment";
 
-  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
-
-  outputs = { self, nixpkgs }:
-    let
-      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
-      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
-    in
-    {
-      devShells = forEachSupportedSystem ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = (with pkgs; [ elixir ]) ++
+  inputs = {
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        # documentation
+        # https://nixos.org/manual/nixpkgs/stable/#sec-beam
+
+        # ==== ERLANG ====
+
+        # use whatever version is currently defined in nixpkgs
+        # erlang = pkgs.beam.interpreters.erlang;
+
+        # use latest version of Erlang 27
+        erlang = pkgs.beam.interpreters.erlang_27;
+
+        # specify exact version of Erlang OTP
+        # erlang = pkgs.beam.interpreters.erlang.override {
+        #   version = "26.2.2";
+        #   sha256 = "sha256-7S+mC4pDcbXyhW2r5y8+VcX9JQXq5iEUJZiFmgVMPZ0=";
+        # }
+
+        # ==== BEAM packages ====
+
+        # all BEAM packages will be compile with your preferred erlang version
+        pkgs-beam = pkgs.beam.packagesWith erlang;
+
+        # ==== Elixir ====
+
+        # use whatever version is currently defined in nixpkgs
+        # elixir = pkgs-beam.elixir;
+
+        # use latest version of Elixir 1.17
+        elixir = pkgs-beam.elixir_1_17;
+
+        # specify exact version of Elixir
+        # elixir = pkgs-beam.elixir.override {
+        #   version = "1.17.1";
+        #   sha256 = "sha256-a7A+426uuo3bUjggkglY1lqHmSbZNpjPaFpQUXYtW9k=";
+        # };
+
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          packages =
+            [
+              # use the Elixr/OTP versions defined above; will also install OTP, mix, hex, rebar3
+              elixir
+
+              # mix needs it for downloading dependencies
+              pkgs.git
+
+              # probably needed for your Phoenix assets
+              pkgs.nodejs_20
+            ]
+            ++
             # Linux only
-            (pkgs.lib.optionals (pkgs.stdenv.isLinux)
-              (with pkgs; [ gigalixir inotify-tools libnotify ])) ++
-            # macOS only
-            pkgs.lib.optionals (pkgs.stdenv.isDarwin)
-              ((with pkgs; [ terminal-notifier ]) ++
-                (with pkgs.darwin.apple_sdk.frameworks; [ CoreFoundation CoreServices ]));
+            pkgs.lib.optionals pkgs.stdenv.isLinux (
+              with pkgs;
+              [
+                gigalixir
+                inotify-tools
+                libnotify
+              ]
+            )
+            ++
+              # macOS only
+              pkgs.lib.optionals pkgs.stdenv.isDarwin (
+                with pkgs;
+                [
+                  terminal-notifier
+                  darwin.apple_sdk.frameworks.CoreFoundation
+                  darwin.apple_sdk.frameworks.CoreServices
+                ]
+              );
+
+          # some sane defaults for iex session
+          env = {
+            ERL_INCLUDE_PATH = "${erlang}/lib/erlang/usr/include";
+            ERL_AFLAGS = "+pc unicode -kernel shell_history enabled";
+            ELIXIR_ERL_OPTIONS = "+sssdio 128";
+          };
         };
-      });
-    };
+      }
+    );
 }