diff --git a/.gdbinit b/.gdbinit
index 26a03e4..6924dab 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -2,5 +2,5 @@ target remote :3333
 monitor arm semihosting enable
 set print asm-demangle on
 load
-#break main
+break main
 continue
diff --git a/src/display/Cargo.toml b/src/display/Cargo.toml
index 192a272..2162ae5 100644
--- a/src/display/Cargo.toml
+++ b/src/display/Cargo.toml
@@ -1,9 +1,9 @@
 [package]
 name = "display"
-version = "0.1.0"
+version = "0.2.0"
 
 [dependencies]
 cortex-m-rt="~0.6"
 cortex-m-semihosting="~0.3"
 panic-semihosting = "~0.5"
-microbit="~0.7"
+microbit="~0.8"
diff --git a/src/display/src/main.rs b/src/display/src/main.rs
index ace61df..12ea853 100644
--- a/src/display/src/main.rs
+++ b/src/display/src/main.rs
@@ -69,10 +69,10 @@ impl Display {
     /// Clear display
     pub fn clear(&mut self) {
         for row in &mut self.rows {
-            row.set_low();
+            row.set_low().unwrap();
         }
         for col in &mut self.cols {
-            col.set_high();
+            col.set_high().unwrap();
         }
     }
 
@@ -97,18 +97,18 @@ impl Display {
         let loops = duration_ms / (self.rows.len() as u32 * self.delay_ms);
         for _ in 0..loops {
             for (row_line, led_matrix_row) in self.rows.iter_mut().zip(led_matrix.iter()) {
-                row_line.set_high();
+                row_line.set_high().unwrap();
                 for (col_line, led_matrix_val) in self.cols.iter_mut().zip(led_matrix_row.iter()) {
                     // We are keeping it simple, and not adding brightness
                     if *led_matrix_val > 0 {
-                        col_line.set_low();
+                        col_line.set_low().unwrap();
                     }
                 }
                 delay.delay_ms(self.delay_ms);
                 for col_line in &mut self.cols {
-                    col_line.set_high();
+                    col_line.set_high().unwrap();
                 }
-                row_line.set_low();
+                row_line.set_low().unwrap();
             }
         }
     }
@@ -127,8 +127,8 @@ fn main() -> ! {
         let rx = gpio.pin25.into_floating_input().downgrade();
         // Configure serial communication
         let (mut tx, _) = serial::Serial::uart0(p.UART0, tx, rx, BAUD115200).split();
-        writeln!(tx, "");
-        writeln!(tx, "Init");
+        writeln!(tx, "").unwrap();
+        writeln!(tx, "Init").unwrap();
         
         // Create delay provider
         let mut delay = Delay::new(p.TIMER0);
@@ -179,10 +179,10 @@ fn main() -> ! {
             [0, 1, 1, 1, 0],
         ];
 
-        writeln!(tx, "Starting!");
+        writeln!(tx, "Starting!").unwrap();
 
         loop {
-            writeln!(tx, "I <3 Rust on the micro:bit!");
+            writeln!(tx, "I <3 Rust on the micro:bit!").unwrap();
             leds.display(&mut delay, letter_I, 1000);
             leds.display(&mut delay, heart, 1000);
             leds.display(&mut delay, letter_U, 1000);
diff --git a/src/hello-world/Cargo.toml b/src/hello-world/Cargo.toml
index fcfe7f3..cb55711 100644
--- a/src/hello-world/Cargo.toml
+++ b/src/hello-world/Cargo.toml
@@ -1,9 +1,9 @@
 [package]
 name = "hello"
-version = "0.2.0"
+version = "0.3.0"
 
 [dependencies]
-microbit="~0.7"
+microbit="~0.8"
 cortex-m-rt="~0.6"
 cortex-m-semihosting="~0.3"
 panic-semihosting = "~0.5"
diff --git a/src/hello-world/src/main.rs b/src/hello-world/src/main.rs
index e59397e..ac1d81d 100644
--- a/src/hello-world/src/main.rs
+++ b/src/hello-world/src/main.rs
@@ -26,14 +26,14 @@ fn main() -> ! {
         let rx = gpio.pin25.into_floating_input().downgrade();
         // Configure serial communication
         let (mut tx, _) = serial::Serial::uart0(p.UART0, tx, rx, BAUD115200).split();
-        write!(tx, "serial - start\r\n");
+        write!(tx, "serial - start\r\n").unwrap();
         // Get row and column for display
         let mut led = gpio.pin13.into_push_pull_output();
         let _ = gpio.pin4.into_push_pull_output();
         // Set row high (column starts low)
-        led.set_high();
+        led.set_high().unwrap();
         // Write string with newline and carriage return
-        write!(tx, "serial - LED on\r\n");
+        write!(tx, "serial - LED on\r\n").unwrap();
     }
     panic!("End");
 }