diff --git a/2023/README.md b/2023/README.md
index 66ce7ba..5fcd2ac 100644
--- a/2023/README.md
+++ b/2023/README.md
@@ -2,8 +2,11 @@
 
 |  S  |  M  |  T  |  W  |  T  |  F  |  S  |
 | :-: | :-: | :-: | :-: | :-: | :-: | :-: |
-|     |     |     |     |     |  1  |  2  |
+|     |     |     |     |     | [1] |  2  |
 |  3  |  4  |  5  |  6  |  7  |  8  |  9  |
 | 10  | 11  | 12  | 13  | 14  | 15  | 16  |
 | 17  | 18  | 19  | 20  | 21  | 22  | 23  |
 | 24  | 25  |     |     |     |     |     |
+
+
+[1]: ./elixir/lib/2023/1.ex
diff --git a/2023/elixir/.envrc b/2023/elixir/.envrc
new file mode 100644
index 0000000..24bb1b6
--- /dev/null
+++ b/2023/elixir/.envrc
@@ -0,0 +1 @@
+export ADVENT_OF_CODE_SESSION=53616c7465645f5f18112545c7b5290961cf3f2c965e90c1b68415326ef1f99790e4dde4ef0cebc7abd120ea1b537aada76420516a0ceb883a722a84b81e7a02
diff --git a/2023/elixir/.gitignore b/2023/elixir/.gitignore
index 44fe69c..93c98b2 100644
--- a/2023/elixir/.gitignore
+++ b/2023/elixir/.gitignore
@@ -24,3 +24,6 @@ advent_of_code-*.tar
 
 # Temporary files, for example, from tests.
 /tmp/
+
+# Advent of Code input files
+/input
diff --git a/2023/elixir/.iex.exs b/2023/elixir/.iex.exs
new file mode 100644
index 0000000..795d6b6
--- /dev/null
+++ b/2023/elixir/.iex.exs
@@ -0,0 +1 @@
+import AOC.IEx
diff --git a/2023/elixir/.tool-versions b/2023/elixir/.tool-versions
index ff52406..87ae38b 100644
--- a/2023/elixir/.tool-versions
+++ b/2023/elixir/.tool-versions
@@ -1,2 +1,3 @@
 erlang 26.1.2
 elixir 1.15.7-otp-26
+direnv 2.33.0
diff --git a/2023/elixir/config/config.exs b/2023/elixir/config/config.exs
new file mode 100644
index 0000000..536c8e8
--- /dev/null
+++ b/2023/elixir/config/config.exs
@@ -0,0 +1,9 @@
+import Config
+
+config :advent_of_code_utils,
+  auto_compile?: true,
+  time_calls?: true,
+  gen_tests?: true,
+  session: System.get_env("ADVENT_OF_CODE_SESSION")
+
+config :iex, inspect: [charlists: :as_lists]
diff --git a/2023/elixir/lib/2023/1.ex b/2023/elixir/lib/2023/1.ex
new file mode 100644
index 0000000..9fc0995
--- /dev/null
+++ b/2023/elixir/lib/2023/1.ex
@@ -0,0 +1,27 @@
+import AOC
+
+aoc 2023, 1 do
+  def p1(input) do
+    input
+    |> String.split("\n")
+    |> Stream.map(&get_first_and_last_numbers_as_number/1)
+    |> Enum.sum()
+  end
+
+  def p2(_input) do
+  end
+
+  def get_first_and_last_numbers_as_number(str) do
+    trimmed =
+      str
+      |> String.replace(~r/^[^\d]+/, "")
+      |> String.reverse()
+      |> String.replace(~r/^[^\d]+/, "")
+      |> String.reverse()
+
+    first = String.first(trimmed)
+    last = String.last(trimmed)
+
+    String.to_integer(first <> last)
+  end
+end
diff --git a/2023/elixir/lib/advent_of_code.ex b/2023/elixir/lib/advent_of_code.ex
deleted file mode 100644
index 33601c2..0000000
--- a/2023/elixir/lib/advent_of_code.ex
+++ /dev/null
@@ -1,18 +0,0 @@
-defmodule AdventOfCode do
-  @moduledoc """
-  Documentation for `AdventOfCode`.
-  """
-
-  @doc """
-  Hello world.
-
-  ## Examples
-
-      iex> AdventOfCode.hello()
-      :world
-
-  """
-  def hello do
-    :world
-  end
-end
diff --git a/2023/elixir/mix.exs b/2023/elixir/mix.exs
index 0fa234e..dc60627 100644
--- a/2023/elixir/mix.exs
+++ b/2023/elixir/mix.exs
@@ -21,8 +21,7 @@ defmodule AdventOfCode.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      # {:dep_from_hexpm, "~> 0.3.0"},
-      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+      {:advent_of_code_utils, "~> 4.0.0"}
     ]
   end
 end
diff --git a/2023/elixir/mix.lock b/2023/elixir/mix.lock
new file mode 100644
index 0000000..77df8e0
--- /dev/null
+++ b/2023/elixir/mix.lock
@@ -0,0 +1,5 @@
+%{
+  "advent_of_code_utils": {:hex, :advent_of_code_utils, "4.0.0", "28df8cde0d6cccf95b72880ab89b00e1cb7c0492164bbf537bdf229c0953f7aa", [:mix], [{:floki, "~> 0.34", [hex: :floki, repo: "hexpm", optional: false]}, {:tz, "~> 0.26", [hex: :tz, repo: "hexpm", optional: false]}], "hexpm", "6f44c1f5b901e6a5bd7561361f3441ee7fa4ee67ea28d7fc3b2df29303d80ff4"},
+  "floki": {:hex, :floki, "0.35.2", "87f8c75ed8654b9635b311774308b2760b47e9a579dabf2e4d5f1e1d42c39e0b", [:mix], [], "hexpm", "6b05289a8e9eac475f644f09c2e4ba7e19201fd002b89c28c1293e7bd16773d9"},
+  "tz": {:hex, :tz, "0.26.2", "a40e4bb223344c6fc7b74dda25df1f26b88a30db23fa6e55de843bd79148ccdb", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:mint, "~> 1.5", [hex: :mint, repo: "hexpm", optional: true]}], "hexpm", "224b0618dd1e032778a094040bc710ef9aff6e2fa8fffc2716299486f27b9e68"},
+}
diff --git a/2023/elixir/test/2023/1_test.exs b/2023/elixir/test/2023/1_test.exs
new file mode 100644
index 0000000..291e118
--- /dev/null
+++ b/2023/elixir/test/2023/1_test.exs
@@ -0,0 +1,9 @@
+import AOC
+
+aoc_test 2023, 1, async: true do
+  describe "p1" do
+    test "works for the example input" do
+      assert p1(example_string()) == 142
+    end
+  end
+end
diff --git a/2023/elixir/test/advent_of_code_test.exs b/2023/elixir/test/advent_of_code_test.exs
deleted file mode 100644
index 8a98262..0000000
--- a/2023/elixir/test/advent_of_code_test.exs
+++ /dev/null
@@ -1,8 +0,0 @@
-defmodule AdventOfCodeTest do
-  use ExUnit.Case
-  doctest AdventOfCode
-
-  test "greets the world" do
-    assert AdventOfCode.hello() == :world
-  end
-end
diff --git a/README.md b/README.md
index 0c5cc7b..602d1ec 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@
 1. [2020] **17/50** 🌟
 1. [2021] **43/50** 🌟
 1. [2022] **14/50** 🌟
-1. [2023]
+1. [2023] **1/50** 🌟
 
 [2015]: ./2015
 [2017]: ./2017