diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4df1de9..1bfeec4 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,6 @@ jobs:
           otp-version: "26.0.2"
           gleam-version: "nightly"
           rebar3-version: "3"
-          # elixir-version: "1.15.4"
       - run: gleam deps download
       - run: gleam test
       - run: gleam format --check src test
diff --git a/input/2023/1.txt b/input/2023/1.txt
new file mode 100644
index 0000000..239b44b
--- /dev/null
+++ b/input/2023/1.txt
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\ No newline at end of file
diff --git a/src/aoc_2020/day_10.gleam b/src/aoc_2020/day_10.gleam
index 31cbad6..621c533 100644
--- a/src/aoc_2020/day_10.gleam
+++ b/src/aoc_2020/day_10.gleam
@@ -59,11 +59,15 @@ pub fn pt_2(input: String) -> Int {
 }
 
 fn accumulate_jolts(options: Map(Int, Int), target_jolts: Int) -> Map(Int, Int) {
-  map.insert(options, target_jolts, list.fold([1, 2, 3], 0, fn(acc, diff) {
-    acc + {
-      options
-      |> map.get(target_jolts - diff)
-      |> result.unwrap(0)
-    }
-  }))
+  map.insert(
+    options,
+    target_jolts,
+    list.fold([1, 2, 3], 0, fn(acc, diff) {
+      acc + {
+        options
+        |> map.get(target_jolts - diff)
+        |> result.unwrap(0)
+      }
+    }),
+  )
 }
diff --git a/src/aoc_2020/day_11.gleam b/src/aoc_2020/day_11.gleam
index ace8e1e..006040a 100644
--- a/src/aoc_2020/day_11.gleam
+++ b/src/aoc_2020/day_11.gleam
@@ -198,9 +198,13 @@ fn do_swap(seats: Seats, pos: Pos) -> Seats {
   let assert Ok(row) = map.get(seats, pos.row)
   let assert Ok(spot) = map.get(row, pos.col)
 
-  map.insert(seats, pos.row, map.insert(row, pos.col, case spot {
-    EmptySeat -> FullSeat
-    FullSeat -> EmptySeat
-    _ -> panic
-  }))
+  map.insert(
+    seats,
+    pos.row,
+    map.insert(row, pos.col, case spot {
+      EmptySeat -> FullSeat
+      FullSeat -> EmptySeat
+      _ -> panic
+    }),
+  )
 }
diff --git a/src/aoc_2022/day_1.gleam b/src/aoc_2022/day_1.gleam
index 2aff3df..23d8e63 100644
--- a/src/aoc_2022/day_1.gleam
+++ b/src/aoc_2022/day_1.gleam
@@ -7,10 +7,9 @@ fn parse(input: String) -> List(List(Int)) {
   let assert Ok(input) =
     input
     |> string.split("\n\n")
-    |> list.try_map(function.compose(string.split(_, "\n"), list.try_map(
-      _,
-      int.parse,
-    )))
+    |> list.try_map(
+      function.compose(string.split(_, "\n"), list.try_map(_, int.parse)),
+    )
   input
 }
 
diff --git a/src/aoc_2023/day_1.gleam b/src/aoc_2023/day_1.gleam
new file mode 100644
index 0000000..7b76116
--- /dev/null
+++ b/src/aoc_2023/day_1.gleam
@@ -0,0 +1,58 @@
+import gleam/string
+import gleam/list
+import gleam/bool
+import gleam/int
+
+fn digits_to_calibration(l: List(Int)) -> Int {
+  let #(first, last) = case l {
+    [] -> panic as "each line must contain at least one digit"
+    [x] -> #(x, x)
+    [first, ..] -> {
+      let assert Ok(last) = list.last(l)
+      #(first, last)
+    }
+  }
+
+  10 * first + last
+}
+
+fn process(input: String, pre_process: fn(String) -> List(String)) {
+  input
+  |> string.split("\n")
+  |> list.fold(0, fn(acc, line) {
+    acc + {
+      line
+      |> pre_process
+      |> list.filter_map(int.parse)
+      |> digits_to_calibration
+    }
+  })
+}
+
+fn words(s: String, acc: List(String)) -> List(String) {
+  use <- bool.guard(s == "", list.reverse(acc))
+  let char = case s {
+    "one" <> _ -> "1"
+    "two" <> _ -> "2"
+    "three" <> _ -> "3"
+    "four" <> _ -> "4"
+    "five" <> _ -> "5"
+    "six" <> _ -> "6"
+    "seven" <> _ -> "7"
+    "eight" <> _ -> "8"
+    "nine" <> _ -> "9"
+    _ -> {
+      let assert Ok(first) = string.first(s)
+      first
+    }
+  }
+  words(string.drop_left(s, 1), [char, ..acc])
+}
+
+pub fn pt_1(input: String) {
+  process(input, string.to_graphemes)
+}
+
+pub fn pt_2(input: String) {
+  process(input, words(_, []))
+}
diff --git a/test/advent_of_code_test.gleam b/test/advent_of_code_test.gleam
index 7e95d32..ecd12ad 100644
--- a/test/advent_of_code_test.gleam
+++ b/test/advent_of_code_test.gleam
@@ -1,7 +1,5 @@
 import gleeunit
 
-// import gleeunit/should
-
 pub fn main() {
   gleeunit.main()
 }
diff --git a/test/aoc_2023/day_1_test.gleam b/test/aoc_2023/day_1_test.gleam
new file mode 100644
index 0000000..daecf44
--- /dev/null
+++ b/test/aoc_2023/day_1_test.gleam
@@ -0,0 +1,23 @@
+import aoc_2023/day_1
+import gleeunit/should
+
+pub fn pt_1_test() {
+  "1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet"
+  |> day_1.pt_1
+  |> should.equal(142)
+}
+
+pub fn pt_2_test() {
+  "two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen"
+  |> day_1.pt_2
+  |> should.equal(281)
+}