diff --git a/Cargo.lock b/Cargo.lock
index 43583fe..0720694 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,12 +11,13 @@ dependencies = [
 
 [[package]]
 name = "as-slice"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37dfb65bc03b2bc85ee827004f14a6817e04160e3b1a28931986a666a9290e70"
+checksum = "bb4d1c23475b74e3672afa8c2be22040b8b7783ad9b461021144ed10a46bb0e6"
 dependencies = [
  "generic-array 0.12.3",
  "generic-array 0.13.2",
+ "generic-array 0.14.4",
  "stable_deref_trait",
 ]
 
@@ -35,6 +36,12 @@ dependencies = [
  "rustc_version",
 ]
 
+[[package]]
+name = "bare-metal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8fe8f5a8a398345e52358e18ff07cc17a568fbca5c6f73873d3a62056309603"
+
 [[package]]
 name = "bit_field"
 version = "0.10.1"
@@ -76,12 +83,12 @@ checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
 [[package]]
 name = "cortex-m"
-version = "0.6.3"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2be99930c99669a74d986f7fd2162085498b322e6daae8ef63a97cc9ac1dc73c"
+checksum = "88cdafeafba636c00c467ded7f1587210725a1adfab0c24028a7844b87738263"
 dependencies = [
  "aligned",
- "bare-metal",
+ "bare-metal 0.2.5",
  "bitfield",
  "volatile-register",
 ]
@@ -99,9 +106,9 @@ dependencies = [
 
 [[package]]
 name = "cortex-m-rt"
-version = "0.6.12"
+version = "0.6.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00d518da72bba39496024b62607c1d8e37bcece44b2536664f1132a73a499a28"
+checksum = "980c9d0233a909f355ed297ef122f257942de5e0a2cb1c39f60684b65bcb90fb"
 dependencies = [
  "cortex-m-rt-macros",
  "r0",
@@ -138,9 +145,9 @@ dependencies = [
 
 [[package]]
 name = "embedded-dma"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ce25093adf4f2a76d429644c1f6f0abc10b79d00784a13e5d0cfabcd52b55b76"
+checksum = "46c8c02e4347a0267ca60813c952017f4c5948c232474c6010a381a337f1bda4"
 dependencies = [
  "stable_deref_trait",
 ]
@@ -173,6 +180,16 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "generic-array"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "501466ecc8a30d1d3b7fc9229b122b2ce8ed6e9d9223f1138d4babb253e51817"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "hash32"
 version = "0.1.1"
@@ -218,9 +235,9 @@ checksum = "c75de51135344a4f8ed3cfe2720dc27736f7711989703a0b43aadf3753c55577"
 
 [[package]]
 name = "memchr"
-version = "2.3.3"
+version = "2.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
+checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
 [[package]]
 name = "nb"
@@ -249,9 +266,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.12"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac267bcc07f48ee5f8935ab0d24f316fb722d7a1292e2913f0cc196b29ffd611"
+checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
 dependencies = [
  "autocfg",
  "libm",
@@ -265,9 +282,9 @@ checksum = "4e20e6499bbbc412f280b04a42346b356c6fa0753d5fd22b7bd752ff34c778ee"
 
 [[package]]
 name = "panic-semihosting"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c03864ac862876c16a308f5286f4aa217f1a69ac45df87ad3cd2847f818a642c"
+checksum = "aed16eb761d0ee9161dd1319cb38c8007813b20f9720a5a682b283e7b8cdfe58"
 dependencies = [
  "cortex-m",
  "cortex-m-semihosting",
@@ -292,9 +309,9 @@ checksum = "7c68cb38ed13fd7bc9dd5db8f165b7c8d9c1a315104083a2b10f11354c2af97f"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.20"
+version = "1.0.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "175c513d55719db99da20232b06cda8bab6b83ec2d04e3283edf0213c37c1a29"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
 dependencies = [
  "unicode-xid",
 ]
@@ -346,9 +363,9 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
-version = "1.0.116"
+version = "1.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "96fe57af81d28386a513cbc6858332abc6117cfdb5999647c6444b8f43a370a5"
+checksum = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
 dependencies = [
  "serde_derive",
 ]
@@ -365,9 +382,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.116"
+version = "1.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f630a6370fd8e457873b4bd2ffdae75408bc291ba72be773772a4c2a065d9ae8"
+checksum = "cbd1ae72adb44aab48f325a02444a5fc079349a8d804c1fc922aed3f7454c74e"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -410,7 +427,7 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "11460b4de3a84f072e2cf6e76306c64d27f405a0e83bace0a726f555ddf4bf33"
 dependencies = [
- "bare-metal",
+ "bare-metal 0.2.5",
  "cortex-m",
  "cortex-m-rt",
  "vcell",
@@ -419,9 +436,9 @@ dependencies = [
 [[package]]
 name = "stm32f4xx-hal"
 version = "0.8.3"
-source = "git+https://github.com/stm32-rs/stm32f4xx-hal.git#4a1a019f8e6e81a69c726bcab1f7caadefdbd32e"
+source = "git+https://github.com/stm32-rs/stm32f4xx-hal.git#e80925770d2fe72f0f01a7b46147f4e31d512689"
 dependencies = [
- "bare-metal",
+ "bare-metal 0.2.5",
  "cast",
  "cortex-m",
  "cortex-m-rt",
@@ -436,9 +453,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.40"
+version = "1.0.48"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
+checksum = "cc371affeffc477f42a221a1e4297aedcea33d47d19b61455588bd9d8f6b19ac"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -447,9 +464,9 @@ dependencies = [
 
 [[package]]
 name = "synopsys-usb-otg"
-version = "0.2.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25c7f146100fd844a8bbd4ecf9e825f40e5ddfbf5a6c8af9e15e8623a72c6255"
+checksum = "461676dcf123675b3d3b02e2390e6a690cd186aacf2f439af7673c79e2561d53"
 dependencies = [
  "cortex-m",
  "usb-device",
@@ -460,7 +477,7 @@ dependencies = [
 name = "thermostat"
 version = "0.0.0"
 dependencies = [
- "bare-metal",
+ "bare-metal 1.0.0",
  "bit_field",
  "byteorder",
  "cortex-m",
@@ -469,7 +486,7 @@ dependencies = [
  "eeprom24x",
  "heapless",
  "log",
- "nb 0.1.3",
+ "nb 1.0.0",
  "nom",
  "num-traits",
  "panic-abort",
@@ -499,9 +516,9 @@ checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
 [[package]]
 name = "uom"
-version = "0.29.0"
+version = "0.30.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8bb593f5252356bfb829112f8fca2d0982d48588d2d6bb5a92553b0dfc4c9aba"
+checksum = "e76503e636584f1e10b9b3b9498538279561adcef5412927ba00c2b32c4ce5ed"
 dependencies = [
  "num-traits",
  "serde",
@@ -510,15 +527,15 @@ dependencies = [
 
 [[package]]
 name = "usb-device"
-version = "0.2.5"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e5e2b9ba23f0d9ef7a34e498b6581c9d67944a1916542bfc7238bf1dc0d6acd"
+checksum = "849eed9b4dc61a1f17ba1d7a5078ceb095b9410caa38a506eb281ed5eff12fbd"
 
 [[package]]
 name = "usbd-serial"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b45051be4bc25e6f85caacb1d3f45ace644fcc6e662b3d976330912542b7f69e"
+checksum = "db75519b86287f12dcf0d171c7cf4ecc839149fe9f3b720ac4cfce52959e1dfe"
 dependencies = [
  "embedded-hal",
  "nb 0.1.3",
diff --git a/Cargo.toml b/Cargo.toml
index a818298..c85c3fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,10 +14,10 @@ features = []
 default-target = "thumbv7em-none-eabihf"
 
 [dependencies]
-panic-abort = "0.3.1"
-panic-semihosting = { version = "0.5.1", optional = true }
+panic-abort = "0.3"
+panic-semihosting = { version = "0.5", optional = true }
 log = "0.4"
-bare-metal = "0.2"
+bare-metal = "1"
 cortex-m = "0.6"
 cortex-m-rt = { version = "0.6", features = ["device"] }
 cortex-m-log = { version = "0.6", features = ["log-integration"] }
@@ -30,11 +30,11 @@ nom = { version = "5", default-features = false }
 num-traits = { version = "0.2", default-features = false, features = ["libm"] }
 usb-device = "0.2"
 usbd-serial = "0.1"
-nb = "0.1"
-uom = { version = "0.29", default-features = false, features = ["autoconvert", "si", "f64", "use_serde"] }
+nb = "1"
+uom = { version = "0.30", default-features = false, features = ["autoconvert", "si", "f64", "use_serde"] }
 eeprom24x = "0.3"
 serde = { version = "1.0", default-features = false, features = ["derive"] }
-postcard = "0.5.1"
+postcard = "0.5"
 heapless = "0.5"
 serde-json-core = "0.1"
 
diff --git a/src/net.rs b/src/net.rs
index 031eee4..01f69c6 100644
--- a/src/net.rs
+++ b/src/net.rs
@@ -2,8 +2,7 @@
 //! declared once and globally.
 
 use core::cell::RefCell;
-use cortex_m::interrupt::Mutex;
-use bare_metal::CriticalSection;
+use cortex_m::interrupt::{CriticalSection, Mutex};
 use stm32f4xx_hal::{
     rcc::Clocks,
     stm32::{interrupt, Peripherals, ETHERNET_MAC, ETHERNET_DMA},