diff --git a/examples/benchmarks/aiken.lock b/examples/benchmarks/aiken.lock
index 0a72eb3c..62f2265a 100644
--- a/examples/benchmarks/aiken.lock
+++ b/examples/benchmarks/aiken.lock
@@ -3,12 +3,12 @@
 
 [[requirements]]
 name = "aiken-lang/stdlib"
-version = "1.7.0"
+version = "1.9.0"
 source = "github"
 
 [[packages]]
 name = "aiken-lang/stdlib"
-version = "1.7.0"
+version = "1.9.0"
 requirements = []
 source = "github"
 
diff --git a/examples/benchmarks/aiken.toml b/examples/benchmarks/aiken.toml
index 7223d60f..b246c981 100644
--- a/examples/benchmarks/aiken.toml
+++ b/examples/benchmarks/aiken.toml
@@ -10,5 +10,5 @@ platform = "github"
 
 [[dependencies]]
 name = "aiken-lang/stdlib"
-version = "1.7.0"
+version = "1.9.0"
 source = "github"
diff --git a/examples/benchmarks/lib/benchmarks/knights.ak b/examples/benchmarks/lib/benchmarks/knights.ak
index f6d01146..23926aa5 100644
--- a/examples/benchmarks/lib/benchmarks/knights.ak
+++ b/examples/benchmarks/lib/benchmarks/knights.ak
@@ -1,42 +1,47 @@
 use aiken/list
-use benchmarks/knights/heuristic.{descendants, finished_tour, start_tour}
+use benchmarks/knights/heuristic.{descendants, start_tour, tour_finished}
 use benchmarks/knights/types.{ChessSet, Solution}
-use benchmarks/queue.{
-  Queue, append_all_front, append_front, create_queue, head, is_empty,
-  remove_front, to_list,
+use benchmarks/queue.{Queue}
+
+// ------------------------------------------------------------------ Benchmarks
+
+test bench_knights_100_4x4() {
+  run_knights(100, 4) == []
 }
 
-test run_knights0() {
-  run_knights(100, 0) == []
+test bench_knights_100_6x6() {
+  run_knights(100, 6) == solution_100_6x6()
 }
 
-test run_knights1() {
-  run_knights(100, 2) == []
+test bench_knights_100_8x8() {
+  run_knights(100, 8) == solution_100_8x8()
 }
 
+// ----------------------------------------------------------------------- Setup
+
 fn run_knights(depth: Int, board_size: Int) -> Solution {
-  depth_search(depth, root(board_size), grow, is_fin) |> to_list
+  depth_search(depth, root(board_size), grow, done) |> queue.to_list
 }
 
 fn depth_search(
   depth: Int,
-  queue: Queue<a>,
-  grow_fn: fn(a) -> List<a>,
-  fin_fn: fn(a) -> Bool,
+  xs: Queue<a>,
+  grow: fn(a) -> List<a>,
+  done: fn(a) -> Bool,
 ) -> Queue<a> {
-  if depth == 0 || is_empty(queue) {
-    create_queue()
-  } else if fin_fn(head(queue)) {
-    depth_search(depth - 1, remove_front(queue), grow_fn, fin_fn)
-      |> append_front(head(queue))
+  if depth == 0 || queue.is_empty(xs) {
+    queue.new()
+  } else if done(queue.head(xs)) {
+    depth_search(depth - 1, queue.remove_front(xs), grow, done)
+      |> queue.append_front(queue.head(xs))
   } else {
-    append_all_front(remove_front(queue), grow_fn(head(queue)))
-      |> depth_search(depth - 1, _, grow_fn, fin_fn)
+    queue.append_all_front(queue.remove_front(xs), grow(queue.head(xs)))
+      |> depth_search(depth - 1, _, grow, done)
   }
 }
 
-fn root(sze: Int) -> Queue<(Int, ChessSet)> {
-  append_all_front(create_queue(), mk_starts(sze))
+fn root(size: Int) -> Queue<(Int, ChessSet)> {
+  queue.append_all_front(queue.new(), mk_starts(size))
 }
 
 fn mk_starts(sze: Int) -> List<(Int, ChessSet)> {
@@ -59,13 +64,506 @@ fn interval(a: Int, b: Int) -> List<Int> {
 
 fn grow(item: (Int, ChessSet)) -> List<(Int, ChessSet)> {
   let (x, y) = item
-
-  let const_item = x + 1
-  descendants(y) |> list.map(fn(list_item) { (const_item, list_item) })
+  descendants(y) |> list.map(fn(list_item) { (x + 1, list_item) })
 }
 
-fn is_fin(item: (Int, ChessSet)) -> Bool {
-  let (_, y) = item
-
-  finished_tour(y)
+fn done(item: (Int, ChessSet)) -> Bool {
+  tour_finished(item.2nd)
+}
+
+// ------------------------------------------------------------------ Fixtures
+
+fn solution_100_6x6() {
+  [
+    (
+      0,
+      ChessSet {
+        size: 6,
+        move_number: 36,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (6, 1),
+          (4, 2),
+          (3, 4),
+          (2, 6),
+          (4, 5),
+          (6, 6),
+          (5, 4),
+          (6, 2),
+          (4, 1),
+          (2, 2),
+          (1, 4),
+          (3, 3),
+          (2, 1),
+          (1, 3),
+          (2, 5),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 2),
+          (6, 4),
+          (5, 6),
+          (3, 5),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (4, 3),
+          (5, 1),
+          (6, 3),
+          (5, 5),
+          (3, 6),
+          (1, 5),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+    (
+      0,
+      ChessSet {
+        size: 6,
+        move_number: 36,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (6, 1),
+          (4, 2),
+          (3, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (5, 4),
+          (6, 6),
+          (4, 5),
+          (2, 6),
+          (1, 4),
+          (3, 3),
+          (2, 1),
+          (1, 3),
+          (2, 5),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 2),
+          (6, 4),
+          (5, 6),
+          (3, 5),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (4, 3),
+          (5, 1),
+          (6, 3),
+          (5, 5),
+          (3, 6),
+          (1, 5),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+    (
+      0,
+      ChessSet {
+        size: 6,
+        move_number: 36,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (6, 1),
+          (4, 2),
+          (3, 4),
+          (2, 2),
+          (1, 4),
+          (2, 6),
+          (4, 5),
+          (6, 6),
+          (5, 4),
+          (6, 2),
+          (4, 1),
+          (3, 3),
+          (2, 1),
+          (1, 3),
+          (2, 5),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 2),
+          (6, 4),
+          (5, 6),
+          (3, 5),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (4, 3),
+          (5, 1),
+          (6, 3),
+          (5, 5),
+          (3, 6),
+          (1, 5),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+    (
+      0,
+      ChessSet {
+        size: 6,
+        move_number: 36,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (6, 1),
+          (4, 2),
+          (3, 4),
+          (2, 6),
+          (1, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (5, 4),
+          (6, 6),
+          (4, 5),
+          (3, 3),
+          (2, 1),
+          (1, 3),
+          (2, 5),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 2),
+          (6, 4),
+          (5, 6),
+          (3, 5),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (4, 3),
+          (5, 1),
+          (6, 3),
+          (5, 5),
+          (3, 6),
+          (1, 5),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+  ]
+}
+
+fn solution_100_8x8() {
+  [
+    (
+      0,
+      ChessSet {
+        size: 8,
+        move_number: 64,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (4, 5),
+          (5, 7),
+          (7, 6),
+          (8, 8),
+          (6, 7),
+          (5, 5),
+          (3, 4),
+          (1, 5),
+          (2, 7),
+          (4, 8),
+          (3, 6),
+          (1, 7),
+          (3, 8),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 6),
+          (6, 4),
+          (7, 2),
+          (8, 4),
+          (6, 3),
+          (5, 1),
+          (4, 3),
+          (3, 5),
+          (5, 4),
+          (3, 3),
+          (2, 5),
+          (1, 3),
+          (2, 1),
+          (4, 2),
+          (6, 1),
+          (8, 2),
+          (7, 4),
+          (8, 6),
+          (7, 8),
+          (6, 6),
+          (8, 5),
+          (7, 7),
+          (5, 8),
+          (3, 7),
+          (1, 8),
+          (2, 6),
+          (1, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (8, 1),
+          (7, 3),
+          (5, 2),
+          (7, 1),
+          (8, 3),
+          (7, 5),
+          (8, 7),
+          (6, 8),
+          (4, 7),
+          (2, 8),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+    (
+      0,
+      ChessSet {
+        size: 8,
+        move_number: 64,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (4, 5),
+          (5, 7),
+          (7, 6),
+          (8, 8),
+          (6, 7),
+          (4, 8),
+          (2, 7),
+          (1, 5),
+          (3, 4),
+          (5, 5),
+          (3, 6),
+          (1, 7),
+          (3, 8),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 6),
+          (6, 4),
+          (7, 2),
+          (8, 4),
+          (6, 3),
+          (5, 1),
+          (4, 3),
+          (3, 5),
+          (5, 4),
+          (3, 3),
+          (2, 5),
+          (1, 3),
+          (2, 1),
+          (4, 2),
+          (6, 1),
+          (8, 2),
+          (7, 4),
+          (8, 6),
+          (7, 8),
+          (6, 6),
+          (8, 5),
+          (7, 7),
+          (5, 8),
+          (3, 7),
+          (1, 8),
+          (2, 6),
+          (1, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (8, 1),
+          (7, 3),
+          (5, 2),
+          (7, 1),
+          (8, 3),
+          (7, 5),
+          (8, 7),
+          (6, 8),
+          (4, 7),
+          (2, 8),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+  ]
+}
+
+fn solution_80_8x8() {
+  [
+    (
+      0,
+      ChessSet {
+        size: 8,
+        move_number: 64,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (4, 5),
+          (5, 7),
+          (7, 6),
+          (8, 8),
+          (6, 7),
+          (5, 5),
+          (3, 4),
+          (1, 5),
+          (2, 7),
+          (4, 8),
+          (3, 6),
+          (1, 7),
+          (3, 8),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 6),
+          (6, 4),
+          (7, 2),
+          (8, 4),
+          (6, 3),
+          (5, 1),
+          (4, 3),
+          (3, 5),
+          (5, 4),
+          (3, 3),
+          (2, 5),
+          (1, 3),
+          (2, 1),
+          (4, 2),
+          (6, 1),
+          (8, 2),
+          (7, 4),
+          (8, 6),
+          (7, 8),
+          (6, 6),
+          (8, 5),
+          (7, 7),
+          (5, 8),
+          (3, 7),
+          (1, 8),
+          (2, 6),
+          (1, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (8, 1),
+          (7, 3),
+          (5, 2),
+          (7, 1),
+          (8, 3),
+          (7, 5),
+          (8, 7),
+          (6, 8),
+          (4, 7),
+          (2, 8),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+    (
+      0,
+      ChessSet {
+        size: 8,
+        move_number: 64,
+        start: Some((1, 1)),
+        visited: [
+          (3, 2),
+          (5, 3),
+          (4, 5),
+          (5, 7),
+          (7, 6),
+          (8, 8),
+          (6, 7),
+          (4, 8),
+          (2, 7),
+          (1, 5),
+          (3, 4),
+          (5, 5),
+          (3, 6),
+          (1, 7),
+          (3, 8),
+          (4, 6),
+          (6, 5),
+          (4, 4),
+          (5, 6),
+          (6, 4),
+          (7, 2),
+          (8, 4),
+          (6, 3),
+          (5, 1),
+          (4, 3),
+          (3, 5),
+          (5, 4),
+          (3, 3),
+          (2, 5),
+          (1, 3),
+          (2, 1),
+          (4, 2),
+          (6, 1),
+          (8, 2),
+          (7, 4),
+          (8, 6),
+          (7, 8),
+          (6, 6),
+          (8, 5),
+          (7, 7),
+          (5, 8),
+          (3, 7),
+          (1, 8),
+          (2, 6),
+          (1, 4),
+          (2, 2),
+          (4, 1),
+          (6, 2),
+          (8, 1),
+          (7, 3),
+          (5, 2),
+          (7, 1),
+          (8, 3),
+          (7, 5),
+          (8, 7),
+          (6, 8),
+          (4, 7),
+          (2, 8),
+          (1, 6),
+          (2, 4),
+          (1, 2),
+          (3, 1),
+          (2, 3),
+          (1, 1),
+        ],
+      },
+    ),
+  ]
 }
diff --git a/examples/benchmarks/lib/benchmarks/knights/chess_set.ak b/examples/benchmarks/lib/benchmarks/knights/chess_set.ak
index 8d9454b1..30f78440 100644
--- a/examples/benchmarks/lib/benchmarks/knights/chess_set.ak
+++ b/examples/benchmarks/lib/benchmarks/knights/chess_set.ak
@@ -1,4 +1,3 @@
-use aiken/builtin
 use aiken/list
 use benchmarks/knights/types.{ChessSet, Tile}
 
@@ -12,7 +11,6 @@ pub fn create_board(size: Int, init_square: Tile) -> ChessSet {
 }
 
 pub fn add_piece(board: ChessSet, tile: Tile) -> ChessSet {
-  // record update
   ChessSet {
     ..board,
     move_number: board.move_number + 1,
@@ -25,11 +23,6 @@ pub fn first_piece(board: ChessSet) -> Tile {
   tile
 }
 
-// {-# INLINABLE lastPiece #-}
-// lastPiece :: ChessSet -> Tile
-// lastPiece (Board _ _ _ (t:_)) = t
-// lastPiece _                   = Tx.error ()
-
 pub fn last_piece(board: ChessSet) -> Tile {
   when board.visited is {
     [] -> fail
@@ -70,58 +63,5 @@ fn second_last(visited: List<a>) -> Option<a> {
 }
 
 pub fn is_square_free(board: ChessSet, tile: Tile) -> Bool {
-  not_in(board.visited, tile)
+  !list.has(board.visited, tile)
 }
-
-pub fn not_in(tiles: List<a>, tile: a) -> Bool {
-  !list.has(tiles, tile)
-}
-// {-# INLINABLE positionPiece #-}
-// positionPiece :: Integer -> ChessSet -> Tile
-// positionPiece x (Board _ n _ ts) = ts Tx.!! (n - x)
-
-// {-# INLINABLE pieceAtTile #-}
-// pieceAtTile :: Tile -> ChessSet -> Integer
-// pieceAtTile x0 (Board _ _ _ ts)
-//    = findPiece x0 ts
-//      where
-//         findPiece _ [] = Tx.error ()
-//         findPiece x (y:xs)
-//            | x == y    = 1 + Tx.length xs
-//            | otherwise = findPiece x xs
-
-// -- % Everything below here is only needed for printing boards.
-// -- % This is useful for debugging.
-
-// instance Haskell.Show ChessSet where
-//    showsPrec _ (Board sze n _ ts)
-//       = Haskell.showString (printBoard sze sortedTrail 1)
-//         where sortedTrail = quickSort (assignMoveNo ts sze n)
-
-// assignMoveNo :: [Tile] -> Integer -> Integer -> [Tile]
-// assignMoveNo [] _ _
-//    = []
-// assignMoveNo ((x,y):t) size z
-//    = (((y-1)*size)+x,z):assignMoveNo t size (z-1)
-
-// printBoard :: Integer -> [Tile] -> Integer -> Haskell.String
-// printBoard s [] n
-//    | (n  > (s*s))   = ""
-//    | ((n `Haskell.mod` s) /=0)= "*"++(spaces (s*s) 1) ++(printBoard s [] (n+1))
-//    | ((n `Haskell.mod` s) ==0)= "*\n"                 ++(printBoard s [] (n+1))
-// printBoard s trail@((i,j):xs) n
-//    | (i==n) &&
-//      ((n `Haskell.mod` s) ==0) = (Haskell.show j)++"\n"++(printBoard s xs (n+1))
-//    | (i==n) &&
-//      ((n `Haskell.mod` s) /=0)= (Haskell.show j)++(spaces (s*s) j)++(printBoard s xs    (n+1))
-//    | ((n `Haskell.mod` s) /=0)= "*"     ++(spaces (s*s) 1)++(printBoard s trail (n+1))
-//    | ((n `Haskell.mod` s) ==0)= "*\n"                     ++(printBoard s trail (n+1))
-// printBoard _ _ _ = "?"
-
-// spaces :: Integer -> Integer -> Haskell.String
-// spaces s y =
-//     take' ((logTen s) - (logTen y) + 1) [' ',' '..]
-//         where
-//           logTen :: Integer -> Integer
-//           logTen 0 = 0
-//           logTen x = 1 + logTen (x `Haskell.div` 10)
diff --git a/examples/benchmarks/lib/benchmarks/knights/heuristic.ak b/examples/benchmarks/lib/benchmarks/knights/heuristic.ak
index 9099b24a..e89b5968 100644
--- a/examples/benchmarks/lib/benchmarks/knights/heuristic.ak
+++ b/examples/benchmarks/lib/benchmarks/knights/heuristic.ak
@@ -1,9 +1,10 @@
 use aiken/builtin
+use aiken/int
 use aiken/list
 use benchmarks/knights/chess_set.{
   add_piece, create_board, delete_first, first_piece, is_square_free, last_piece,
 }
-use benchmarks/knights/sort.{quick_sort}
+use benchmarks/knights/sort.{quicksort}
 use benchmarks/knights/types.{ChessSet, Tile}
 
 type Direction {
@@ -23,7 +24,6 @@ fn direction_list() {
 
 fn move(direction: Direction, tile: Tile) -> Tile {
   let (x, y) = tile
-
   when direction is {
     UL -> (x - 1, y - 2)
     UR -> (x + 1, y - 2)
@@ -38,13 +38,11 @@ fn move(direction: Direction, tile: Tile) -> Tile {
 
 pub fn start_tour(st: Tile, size: Int) -> ChessSet {
   expect 0 = builtin.remainder_integer(size, 2)
-
   create_board(size, st)
 }
 
-pub fn finished_tour(board: ChessSet) -> Bool {
+pub fn tour_finished(board: ChessSet) -> Bool {
   let ChessSet { move_number, size, .. } = board
-
   move_number == size * size && can_jump_first(board)
 }
 
@@ -78,9 +76,8 @@ pub fn dead_end(board: ChessSet) -> Bool {
 }
 
 pub fn single_descend(board: ChessSet) -> List<ChessSet> {
-  let descendants_and_moves = desc_and_no(board)
   list.filter_map(
-    descendants_and_moves,
+    desc_and_no(board),
     fn(item) {
       let (moves, board) = item
       if moves == 1 {
@@ -96,16 +93,15 @@ pub fn desc_and_no(board: ChessSet) -> List<(Int, ChessSet)> {
   board
     |> all_descend
     |> list.map(
-         fn(item) {
-           (item |> delete_first |> possible_moves |> list.length, item)
-         },
-       )
+        fn(item) {
+          (item |> delete_first |> possible_moves |> list.length, item)
+        },
+      )
 }
 
 pub fn can_move_to(board: ChessSet, tile: Tile) -> Bool {
   let (x, y) = tile
   let size = board.size
-
   and {
     x >= 1,
     x <= size,
@@ -122,7 +118,7 @@ fn can_move(board: ChessSet, direction: Direction) -> Bool {
 pub fn all_descend(board: ChessSet) -> List<ChessSet> {
   board
     |> possible_moves
-    |> list.map(fn(direction) { move_knight(board, direction) })
+    |> list.map(move_knight(board, _))
 }
 
 fn move_knight(board: ChessSet, direction: Direction) -> ChessSet {
diff --git a/examples/benchmarks/lib/benchmarks/knights/types.ak b/examples/benchmarks/lib/benchmarks/knights/types.ak
index fc293456..16b50c6d 100644
--- a/examples/benchmarks/lib/benchmarks/knights/types.ak
+++ b/examples/benchmarks/lib/benchmarks/knights/types.ak
@@ -4,8 +4,8 @@ pub type Tile =
 pub type ChessSet {
   size: Int,
   move_number: Int,
-  visited: List<Tile>,
   start: Option<Tile>,
+  visited: List<Tile>,
 }
 
 pub type Solution =
diff --git a/examples/benchmarks/lib/benchmarks/queue.ak b/examples/benchmarks/lib/benchmarks/queue.ak
index 9a5fbb06..0abd9c76 100644
--- a/examples/benchmarks/lib/benchmarks/queue.ak
+++ b/examples/benchmarks/lib/benchmarks/queue.ak
@@ -4,38 +4,35 @@ pub opaque type Queue<a> {
   inner: List<a>,
 }
 
-pub fn create_queue() -> Queue<a> {
+pub fn new() -> Queue<a> {
   [] |> Queue
 }
 
-pub fn to_list(queue: Queue<a>) -> List<a> {
-  queue.inner
+pub fn to_list(self: Queue<a>) -> List<a> {
+  self.inner
 }
 
-pub fn is_empty(queue: Queue<a>) -> Bool {
-  when queue.inner is {
+pub fn is_empty(self: Queue<a>) -> Bool {
+  when self.inner is {
     [] -> True
     _ -> False
   }
 }
 
-pub fn append_front(queue: Queue<a>, item: a) -> Queue<a> {
-  list.push(queue.inner, item) |> Queue
+pub fn append_front(self: Queue<a>, item: a) -> Queue<a> {
+  list.push(self.inner, item) |> Queue
 }
 
-/// Add all items from the list to the front of the queue
-pub fn append_all_front(queue: Queue<a>, items: List<a>) -> Queue<a> {
-  list.concat(items, queue.inner) |> Queue
+pub fn append_all_front(self: Queue<a>, items: List<a>) -> Queue<a> {
+  list.concat(items, self.inner) |> Queue
 }
 
-pub fn remove_front(queue: Queue<a>) -> Queue<a> {
-  expect [_, ..rest] = queue.inner
-
+pub fn remove_front(self: Queue<a>) -> Queue<a> {
+  expect [_, ..rest] = self.inner
   rest |> Queue
 }
 
-pub fn head(queue: Queue<a>) -> a {
-  expect [q, ..] = queue.inner
-
+pub fn head(self: Queue<a>) -> a {
+  expect [q, ..] = self.inner
   q
 }
diff --git a/examples/hello_world/aiken.toml b/examples/hello_world/aiken.toml
index 1e530f11..3b523f22 100644
--- a/examples/hello_world/aiken.toml
+++ b/examples/hello_world/aiken.toml
@@ -5,5 +5,5 @@ description = "Aiken contracts for project 'aiken-lang/hello_world'"
 
 [[dependencies]]
 name = "aiken-lang/stdlib"
-version = "1.7.0"
+version = "main"
 source = "github"
diff --git a/examples/hello_world/plutus.json b/examples/hello_world/plutus.json
index 5b6e3cc0..a0fab843 100644
--- a/examples/hello_world/plutus.json
+++ b/examples/hello_world/plutus.json
@@ -6,7 +6,7 @@
     "plutusVersion": "v2",
     "compiler": {
       "name": "Aiken",
-      "version": "v1.0.21-alpha+4b04517"
+      "version": "v1.0.19-alpha+d56d518"
     }
   },
   "validators": [