diff --git a/src/display/Cargo.toml b/src/display/Cargo.toml
index 2162ae5..6da3b6e 100644
--- a/src/display/Cargo.toml
+++ b/src/display/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "display"
 version = "0.2.0"
+edition = "2018"
 
 [dependencies]
 cortex-m-rt="~0.6"
diff --git a/src/getting-started/Cargo.toml b/src/getting-started/Cargo.toml
index aaa895e..9ade1fd 100644
--- a/src/getting-started/Cargo.toml
+++ b/src/getting-started/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "start"
 version = "0.3.0"
+edition = "2018"
 
 [dependencies]
 panic-halt = "~0.2"
diff --git a/src/hello-world/Cargo.toml b/src/hello-world/Cargo.toml
index cb55711..3954304 100644
--- a/src/hello-world/Cargo.toml
+++ b/src/hello-world/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "hello"
 version = "0.3.0"
+edition = "2018"
 
 [dependencies]
 microbit="~0.8"
diff --git a/src/microbit/Cargo.toml b/src/microbit/Cargo.toml
index 9ad5b94..ef9ad35 100644
--- a/src/microbit/Cargo.toml
+++ b/src/microbit/Cargo.toml
@@ -1,6 +1,7 @@
 [package]
 name = "micro"
 version = "0.2.0"
+edition = "2018"
 
 [dependencies]
 cortex-m-rt="~0.6"
diff --git a/src/serial/Cargo.toml b/src/serial/Cargo.toml
index 3de0ebc..b1b714e 100644
--- a/src/serial/Cargo.toml
+++ b/src/serial/Cargo.toml
@@ -1,10 +1,11 @@
 [package]
 name = "serial"
-version = "0.1.0"
+version = "0.2.0"
+edition = "2018"
 
 [dependencies]
 heapless="~0.5"
 cortex-m-rt="~0.6"
 cortex-m-semihosting="~0.3"
 panic-semihosting = "~0.5"
-microbit="~0.7"
+microbit="~0.8"
diff --git a/src/serial/src/main.rs b/src/serial/src/main.rs
index edc51a4..71494fd 100644
--- a/src/serial/src/main.rs
+++ b/src/serial/src/main.rs
@@ -13,7 +13,7 @@ use sh::hio;
 use microbit::hal::prelude::*;
 use microbit::hal::serial;
 use microbit::hal::serial::BAUD115200;
-use microbit::hal::nb::block;
+use microbit::block;
 
 #[entry]
 fn main() -> ! {