diff --git a/Cargo.toml b/Cargo.toml
index 35fcfc3..f88f913 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,27 +4,23 @@ version = "0.1.0"
 authors = ["Levi Pearson <levipearson@gmail.com>"]
 description = "Base binary crate for STM32F103 Blue Pill boards"
 categories = ["embedded", "no-std"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
-cortex-m = "0.6.2"
-cortex-m-rt = "0.6.12"
-#cortex-m-semihosting = "0.3.5"
-# alternate panic impls, choose only one!
-#panic-halt = "0.2.0"
-#panic-semihosting = "0.5.3" # requires cortex-m-semihosting
-#panic-itm = "0.4.1"
-#panic-abort = "0.3.2"
-#panic-ramdump = "0.1.1"
-#panic-persist = "0.2.1"
-panic-rtt-target = { version = "0.1.0", features = ["cortex-m"] }
+cortex-m = "0.7.4"
+cortex-m-rt = "0.7.1"
 embedded-hal = "0.2.4"
 nb = "1.0.0"
-rtt-target = { version = "0.2.0", features = ["cortex-m"] }
-
-[dependencies.stm32f1xx-hal]
-version = "0.6.1"
-features = ["rt", "stm32f103", "medium"]
+stm32f1xx-hal = { version = "0.8.0", features = ["rt", "stm32f103", "medium"] }
+rtt-target = { version = "0.3.1", features = ["cortex-m"] }
+panic-rtt-target = { version = "0.1.0", features = ["cortex-m"] }
+# alternate panic impls, choose only one!
+#   panic-halt
+#   panic-semihosting # requires cortex-m-semihosting
+#   panic-itm
+#   panic-abort
+#   panic-ramdump
+#   panic-persist
 
 [[bin]]
 name = "blue_pill_base"
diff --git a/src/main.rs b/src/main.rs
index fd55b1a..6e53242 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,18 +9,13 @@
 #![no_std]
 #![cfg_attr(not(doc), no_main)]
 
-use rtt_target::{rprintln, rtt_init_print};
 use panic_rtt_target as _;
+use rtt_target::{rprintln, rtt_init_print};
 
 use nb::block;
 
-use stm32f1xx_hal::{
-    prelude::*,
-    pac,
-    timer::Timer,
-};
 use cortex_m_rt::entry;
-use embedded_hal::digital::v2::OutputPin;
+use stm32f1xx_hal::{pac, prelude::*, timer::Timer};
 
 #[entry]
 fn main() -> ! {
@@ -34,14 +29,14 @@ fn main() -> ! {
     // Take ownership over the raw flash and rcc devices and convert them into the corresponding
     // HAL structs
     let mut flash = dp.FLASH.constrain();
-    let mut rcc = dp.RCC.constrain();
+    let rcc = dp.RCC.constrain();
 
     // Freeze the configuration of all the clocks in the system and store the frozen frequencies in
     // `clocks`
     let clocks = rcc.cfgr.freeze(&mut flash.acr);
 
     // Acquire the GPIOC peripheral
-    let mut gpioc = dp.GPIOC.split(&mut rcc.apb2);
+    let mut gpioc = dp.GPIOC.split();
 
     // Configure gpio C pin 13 as a push-pull output. The `crh` register is passed to the function
     // in order to configure the port. For pins 0-7, crl should be passed instead.
@@ -54,9 +49,9 @@ fn main() -> ! {
     let mut i = 0;
     loop {
         block!(timer.wait()).unwrap();
-        led.set_high().unwrap();
+        led.set_high();
         block!(timer.wait()).unwrap();
-        led.set_low().unwrap();
+        led.set_low();
         i += 1;
         rprintln!("Hello again; I have blinked {} times.", i);
         if i == 10 {