diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..44610e5
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake;
diff --git a/.gitignore b/.gitignore
index e59a32f..c307b79 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,6 @@
 /docs
 erl_crash.dump
 *.ez
+.direnv/
+.hex/
+.mix/
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..c0137b3
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "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": 1724395761,
+        "narHash": "sha256-zRkDV/nbrnp3Y8oCADf5ETl1sDrdmAW6/bBVJ8EbIdQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "ae815cee91b417be55d43781eb4b73ae1ecc396c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "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",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..21c6654
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,57 @@
+{
+  description = "tqdm elixir flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = import nixpkgs {
+        inherit system;
+        config.allowUnfreePredicate = pkg:
+          builtins.elem (nixpkgs.lib.getName pkg) [
+          ];
+      };
+
+      inherit (pkgs) inotify-tools terminal-notifier;
+      inherit (pkgs.lib) optionals;
+      inherit (pkgs.stdenv) isDarwin isLinux;
+
+      linuxDeps = optionals isLinux [inotify-tools];
+      darwinDeps =
+        optionals isDarwin [terminal-notifier]
+        ++ (with pkgs.darwin.apple_sdk.frameworks;
+          optionals isDarwin [
+            CoreFoundation
+            CoreServices
+          ]);
+    in {
+      devShells = {
+        default = pkgs.mkShell {
+          packages = with pkgs;
+            [
+              beam.packages.erlang_25.elixir_1_15
+            ]
+            ++ linuxDeps
+            ++ darwinDeps;
+          shellHook = ''
+            # this allows mix to work on the local directory
+            mkdir -p .mix .hex
+            export MIX_HOME=$PWD/.mix
+            export HEX_HOME=$PWD/.hex
+            # make hex from Nixpkgs available
+            export PATH=$MIX_HOME/bin:$HEX_HOME/bin:$PATH
+            export LANG=C.UTF-8
+            # keep your shell history in iex
+            export ERL_AFLAGS="-kernel shell_history enabled"
+          '';
+        };
+      };
+    });
+}
diff --git a/lib/tqdm.ex b/lib/tqdm.ex
index 82f2941..f701aa1 100644
--- a/lib/tqdm.ex
+++ b/lib/tqdm.ex
@@ -27,13 +27,13 @@ defmodule Tqdm do
   """
 
   @type option ::
-    {:description, String.t} |
-    {:total, non_neg_integer} |
-    {:clear, boolean} |
-    {:device, IO.device} |
-    {:min_interval, non_neg_integer} |
-    {:min_iterations, non_neg_integer} |
-    {:total_segments, non_neg_integer}
+          {:description, String.t()}
+          | {:total, non_neg_integer}
+          | {:clear, boolean}
+          | {:device, IO.device()}
+          | {:min_interval, non_neg_integer}
+          | {:min_iterations, non_neg_integer}
+          | {:total_segments, non_neg_integer}
 
   @type options :: [option]
 
@@ -77,7 +77,7 @@ defmodule Tqdm do
       segments. You can customize this by passing a different value for this
       option.
   """
-  @spec tqdm(Enumerable.t, options) :: Enumerable.t
+  @spec tqdm(Enumerable.t(), options) :: Enumerable.t()
   def tqdm(enumerable, options \\ []) do
     start_fun = fn ->
       now = System.monotonic_time()
@@ -97,7 +97,7 @@ defmodule Tqdm do
         min_interval:
           options
           |> Keyword.get(:min_interval, 100)
-          |> System.convert_time_unit(:milliseconds, :native),
+          |> System.convert_time_unit(:millisecond, :native),
         min_iterations: Keyword.get(options, :min_iterations, 1),
         total_segments: Keyword.get(options, :total_segments, 10)
       }
@@ -114,10 +114,11 @@ defmodule Tqdm do
   end
 
   defp do_tqdm(
-    element,
-    %{n: n, last_print_n: last_print_n, min_iterations: min_iterations} = state
-  ) when n - last_print_n < min_iterations,
-    do: {[element], %{state | n: n + 1}}
+         element,
+         %{n: n, last_print_n: last_print_n, min_iterations: min_iterations} = state
+       )
+       when n - last_print_n < min_iterations,
+       do: {[element], %{state | n: n + 1}}
 
   defp do_tqdm(element, state) do
     now = System.monotonic_time()
@@ -168,7 +169,7 @@ defmodule Tqdm do
 
   defp format_status(state, now) do
     elapsed =
-      System.convert_time_unit(now - state.start_time, :native, :microseconds)
+      System.convert_time_unit(now - state.start_time, :native, :microsecond)
 
     elapsed_str = format_interval(elapsed, false)
 
@@ -194,7 +195,7 @@ defmodule Tqdm do
       left = format_left(n, elapsed, total)
 
       "|#{bar}| #{n}/#{total} #{percentage} " <>
-      "[elapsed: #{elapsed_str} left: #{left}, #{rate} iters/sec]"
+        "[elapsed: #{elapsed_str} left: #{left}, #{rate} iters/sec]"
     else
       "#{n} [elapsed: #{elapsed_str}, #{rate} iters/sec]"
     end
@@ -202,16 +203,18 @@ defmodule Tqdm do
 
   defp format_rate(elapsed, n) when elapsed > 0,
     do: Float.round(n / (elapsed / 1_000_000), 2)
+
   defp format_rate(_elapsed, _n),
     do: "?"
 
   defp format_bar(num_segments, total_segments) do
     String.duplicate("#", num_segments) <>
-    String.duplicate("-", total_segments - num_segments)
+      String.duplicate("-", total_segments - num_segments)
   end
 
   defp format_left(n, elapsed, total) when n > 0,
     do: format_interval(elapsed / n * (total - n), true)
+
   defp format_left(_n, _elapsed, _total),
     do: "?"
 
@@ -233,6 +236,7 @@ defmodule Tqdm do
 
   defp format_time_component(time) when time < 10,
     do: "0#{time}"
+
   defp format_time_component(time),
     do: to_string(time)
 end
diff --git a/mix.exs b/mix.exs
index ce10cea..17d1504 100644
--- a/mix.exs
+++ b/mix.exs
@@ -1,15 +1,15 @@
 defmodule Tqdm.Mixfile do
   use Mix.Project
 
-  @version "0.0.3"
+  @version "0.0.4"
 
   def project do
     [
       app: :tqdm,
       version: @version,
-      elixir: "~> 1.3",
-      build_embedded: Mix.env == :prod,
-      start_permanent: Mix.env == :prod,
+      elixir: "~> 1.15",
+      build_embedded: Mix.env() == :prod,
+      start_permanent: Mix.env() == :prod,
       deps: deps(),
       description: description(),
       package: package(),
@@ -20,17 +20,22 @@ defmodule Tqdm.Mixfile do
         source_ref: "v#{@version}"
       ],
       test_coverage: [tool: ExCoveralls],
-      preferred_cli_env: ["coveralls": :test, "coveralls.detail": :test, "coveralls.post": :test, "coveralls.html": :test],
+      preferred_cli_env: [
+        coveralls: :test,
+        "coveralls.detail": :test,
+        "coveralls.post": :test,
+        "coveralls.html": :test
+      ]
     ]
   end
 
   defp deps do
     [
-      {:credo, "~> 0.3", only: [:dev, :test]},
-      {:dialyxir, "~> 0.3", only: [:dev, :test]},
-      {:earmark, "~> 1.2", only: :dev},
-      {:ex_doc, "~> 0.18", only: :dev},
-      {:excoveralls, "~> 0.4", only: :test},
+      {:credo, ">= 0.0.0", only: [:test, :dev], runtime: false},
+      {:dialyxir, ">= 0.0.0", only: [:test, :dev], runtime: false},
+      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
+      {:earmark, "~> 1.4", only: :dev},
+      {:excoveralls, "~> 0.5", only: :test},
       {:inch_ex, ">= 0.0.0", only: :docs}
     ]
   end
diff --git a/mix.lock b/mix.lock
index c3819d4..9960274 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,17 +1,19 @@
-%{"bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm"},
-  "certifi": {:hex, :certifi, "2.0.0", "a0c0e475107135f76b8c1d5bc7efb33cd3815cb3cf3dea7aefdd174dabead064", [:rebar3], [], "hexpm"},
-  "credo": {:hex, :credo, "0.8.10", "261862bb7363247762e1063713bb85df2bbd84af8d8610d1272cd9c1943bba63", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}], "hexpm"},
-  "dialyxir": {:hex, :dialyxir, "0.5.1", "b331b091720fd93e878137add264bac4f644e1ddae07a70bf7062c7862c4b952", [:mix], [], "hexpm"},
-  "earmark": {:hex, :earmark, "1.2.4", "99b637c62a4d65a20a9fb674b8cffb8baa771c04605a80c911c4418c69b75439", [:mix], [], "hexpm"},
-  "ex_doc": {:hex, :ex_doc, "0.18.1", "37c69d2ef62f24928c1f4fdc7c724ea04aecfdf500c4329185f8e3649c915baf", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
-  "excoveralls": {:hex, :excoveralls, "0.8.0", "99d2691d3edf8612f128be3f9869c4d44b91c67cec92186ce49470ae7a7404cf", [:mix], [{:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm"},
-  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm"},
-  "hackney": {:hex, :hackney, "1.10.1", "c38d0ca52ea80254936a32c45bb7eb414e7a96a521b4ce76d00a69753b157f21", [:rebar3], [{:certifi, "2.0.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
-  "idna": {:hex, :idna, "5.1.0", "d72b4effeb324ad5da3cab1767cb16b17939004e789d8c0ad5b70f3cea20c89a", [:rebar3], [{:unicode_util_compat, "0.3.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},
-  "inch_ex": {:hex, :inch_ex, "0.5.6", "418357418a553baa6d04eccd1b44171936817db61f4c0840112b420b8e378e67", [:mix], [{:poison, "~> 1.5 or ~> 2.0 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
-  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm"},
-  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm"},
-  "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], [], "hexpm"},
-  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm"},
-  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.1", "28a4d65b7f59893bc2c7de786dec1e1555bd742d336043fe644ae956c3497fbe", [:make, :rebar], [], "hexpm"},
-  "unicode_util_compat": {:hex, :unicode_util_compat, "0.3.1", "a1f612a7b512638634a603c8f401892afbf99b8ce93a45041f8aaca99cadb85e", [:rebar3], [], "hexpm"}}
+%{
+  "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm", "7af5c7e09fe1d40f76c8e4f9dd2be7cebd83909f31fee7cd0e9eadc567da8353"},
+  "certifi": {:hex, :certifi, "2.0.0", "a0c0e475107135f76b8c1d5bc7efb33cd3815cb3cf3dea7aefdd174dabead064", [:rebar3], [], "hexpm", "fdc6066ceeccb3aa14049ab6edf0b9af3b64ae1b0db2a92d5c52146f373bbb1c"},
+  "credo": {:hex, :credo, "0.8.10", "261862bb7363247762e1063713bb85df2bbd84af8d8610d1272cd9c1943bba63", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}], "hexpm", "f3fe29f8de6be431c7736a933a3897fe9aa45533b1d1358b3691ac8ec4371e8f"},
+  "dialyxir": {:hex, :dialyxir, "0.5.1", "b331b091720fd93e878137add264bac4f644e1ddae07a70bf7062c7862c4b952", [:mix], [], "hexpm", "6c32a70ed5d452c6650916555b1f96c79af5fc4bf286997f8b15f213de786f73"},
+  "earmark": {:hex, :earmark, "1.4.47", "7e7596b84fe4ebeb8751e14cbaeaf4d7a0237708f2ce43630cfd9065551f94ca", [:mix], [], "hexpm", "3e96bebea2c2d95f3b346a7ff22285bc68a99fbabdad9b655aa9c6be06c698f8"},
+  "ex_doc": {:hex, :ex_doc, "0.18.1", "37c69d2ef62f24928c1f4fdc7c724ea04aecfdf500c4329185f8e3649c915baf", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm", "f050061c87ad39478c942995b5a20c40f2c0bc06525404613b8b0474cb8bd796"},
+  "excoveralls": {:hex, :excoveralls, "0.8.0", "99d2691d3edf8612f128be3f9869c4d44b91c67cec92186ce49470ae7a7404cf", [:mix], [{:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: false]}, {:hackney, ">= 0.12.0", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "74bdeec4a69d4b41f2099c73e25d3b210685702ed52ccc31df66a3597ebe6675"},
+  "exjsx": {:hex, :exjsx, "4.0.0", "60548841e0212df401e38e63c0078ec57b33e7ea49b032c796ccad8cde794b5c", [:mix], [{:jsx, "~> 2.8.0", [hex: :jsx, repo: "hexpm", optional: false]}], "hexpm", "32e95820a97cffea67830e91514a2ad53b888850442d6d395f53a1ac60c82e07"},
+  "hackney": {:hex, :hackney, "1.10.1", "c38d0ca52ea80254936a32c45bb7eb414e7a96a521b4ce76d00a69753b157f21", [:rebar3], [{:certifi, "2.0.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "6b1980a33628824ec829239b6f9bfc455f60eebc19d3096a215f5f6170d675cf"},
+  "idna": {:hex, :idna, "5.1.0", "d72b4effeb324ad5da3cab1767cb16b17939004e789d8c0ad5b70f3cea20c89a", [:rebar3], [{:unicode_util_compat, "0.3.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "fc1a2f7340c422650504b1662f28fdf381f34cbd30664e8491744e52c9511d40"},
+  "inch_ex": {:hex, :inch_ex, "0.5.6", "418357418a553baa6d04eccd1b44171936817db61f4c0840112b420b8e378e67", [:mix], [{:poison, "~> 1.5 or ~> 2.0 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm", "7123ca0450686a61416a06cd38e26af18fd0f8c1cff5214770a957c6e0724338"},
+  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm", "fc3499fed7a726995aa659143a248534adc754ebd16ccd437cd93b649a95091f"},
+  "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
+  "mimerl": {:hex, :mimerl, "1.0.2", "993f9b0e084083405ed8252b99460c4f0563e41729ab42d9074fd5e52439be88", [:rebar3], [], "hexpm", "7a4c8e1115a2732a67d7624e28cf6c9f30c66711a9e92928e745c255887ba465"},
+  "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm", "fec8660eb7733ee4117b85f55799fd3833eb769a6df71ccf8903e8dc5447cfce"},
+  "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.1", "28a4d65b7f59893bc2c7de786dec1e1555bd742d336043fe644ae956c3497fbe", [:make, :rebar], [], "hexpm", "4f8805eb5c8a939cf2359367cb651a3180b27dfb48444846be2613d79355d65e"},
+  "unicode_util_compat": {:hex, :unicode_util_compat, "0.3.1", "a1f612a7b512638634a603c8f401892afbf99b8ce93a45041f8aaca99cadb85e", [:rebar3], [], "hexpm", "da1d9bef8a092cc7e1e51f1298037a5ddfb0f657fe862dfe7ba4c5807b551c29"},
+}