diff --git a/microbit/src/11-snake-game/Cargo.toml b/microbit/src/11-snake-game/Cargo.toml
index de02fcb7..15fa3a18 100644
--- a/microbit/src/11-snake-game/Cargo.toml
+++ b/microbit/src/11-snake-game/Cargo.toml
@@ -17,13 +17,13 @@ optional = true
 [dependencies]
 cortex-m = "0.7.3"
 cortex-m-rt = "0.7.0"
-rtt-target = { version = "0.3.1", features = ["cortex-m"] }
-panic-rtt-target = { version = "0.1.2", features = ["cortex-m"] }
 lsm303agr = "0.2.2"
 nb = "1.0.0"
 libm = "0.2.1"
 heapless = "0.8.0"
 tiny-led-matrix = "1.0.1"
+rtt-target = "0.6.1"
+panic-rtt-target = "0.2.0"
 
 [features]
 v2 = ["microbit-v2"]
diff --git a/microbit/src/11-snake-game/src/game.rs b/microbit/src/11-snake-game/src/game.rs
index 35523fdb..3246843d 100644
--- a/microbit/src/11-snake-game/src/game.rs
+++ b/microbit/src/11-snake-game/src/game.rs
@@ -88,9 +88,9 @@ pub enum GameStatus {
 /// The outcome of a single move/step.
 enum StepOutcome {
     /// Grid full (player wins)
-    Full(Coords),
+    Full,
     /// Snake has collided with itself (player loses)
-    Collision(Coords),
+    Collision,
     /// Snake has eaten some food
     Eat(Coords),
     /// Snake has moved (and nothing else has happened)
@@ -248,13 +248,13 @@ impl Game {
             // won't actually be any collision (as the tail will have moved by the time the head
             // moves onto the tile)
             if next_move != *self.snake.tail.peek().unwrap() {
-                StepOutcome::Collision(next_move)
+                StepOutcome::Collision
             } else {
                 StepOutcome::Move(next_move)
             }
         } else if next_move == self.food_coords {
             if self.snake.tail.len() == 23 {
-                StepOutcome::Full(next_move)
+                StepOutcome::Full
             } else {
                 StepOutcome::Eat(next_move)
             }
@@ -266,8 +266,8 @@ impl Game {
     /// Handle the outcome of a step, updating the game's internal state.
     fn handle_step_outcome(&mut self, outcome: StepOutcome) {
         self.status = match outcome {
-            StepOutcome::Collision(_) => GameStatus::Lost,
-            StepOutcome::Full(_) => GameStatus::Won,
+            StepOutcome::Collision => GameStatus::Lost,
+            StepOutcome::Full => GameStatus::Won,
             StepOutcome::Eat(c) => {
                 self.snake.move_snake(c, true);
                 self.place_food();
@@ -333,4 +333,4 @@ impl Game {
         }
         values
     }
-}
\ No newline at end of file
+}
diff --git a/microbit/src/11-snake-game/src/main.rs b/microbit/src/11-snake-game/src/main.rs
index 7f6cebf5..70d4383d 100644
--- a/microbit/src/11-snake-game/src/main.rs
+++ b/microbit/src/11-snake-game/src/main.rs
@@ -22,7 +22,7 @@ use crate::game::{Game, GameStatus};
 #[entry]
 fn main() -> ! {
     rtt_init_print!();
-    let mut board = Board::take().unwrap();
+    let board = Board::take().unwrap();
     let mut timer = Timer::new(board.TIMER0).into_periodic();
     let mut rng = Rng::new(board.RNG);
     let mut game = Game::new(rng.random_u32());