diff --git a/default.nix b/default.nix
index ce67da7..6d4ed41 100644
--- a/default.nix
+++ b/default.nix
@@ -47,7 +47,7 @@ let
   firmware = xbuildRustPackage {
     name = "firmware";
     src = ./firmware;
-    cargoSha256 = "0gw2wlj3r35k3dxnfbshnd9gbni804l6wkqcxc7qx2cf576cfbmj";
+    cargoSha256 = "0lf8h5g8sas36cxzqy0p65qqivnihh4gn4mkc1k210xp7niaymc5";
     nativeBuildInputs = [
       gcc
     ];
diff --git a/firmware/Cargo.lock b/firmware/Cargo.lock
index 54c7bfc..e34b153 100644
--- a/firmware/Cargo.lock
+++ b/firmware/Cargo.lock
@@ -1,10 +1,5 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-[[package]]
-name = "aligned"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "aligned"
 version = "0.3.1"
@@ -37,7 +32,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bitflags"
-version = "1.1.0"
+version = "1.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -52,31 +47,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cc"
-version = "1.0.45"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "compiler_builtins"
-version = "0.1.19"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "cortex-m"
-version = "0.5.10"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "aligned 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -94,19 +78,19 @@ name = "cortex-m-rt"
 version = "0.6.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cortex-m-rt-macros 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m-rt-macros 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "cortex-m-rt-macros"
-version = "0.1.5"
+version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -141,19 +125,19 @@ dependencies = [
  "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "bit_field 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "compiler_builtins 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "compiler_builtins 0.1.21 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cortex-m-rt 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cortex-m-semihosting 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "lexical-core 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lexical-core 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libm 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "nb 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "nom 5.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "smoltcp 0.5.0 (git+https://github.com/m-labs/smoltcp.git?rev=8eb01aca364aefe5f823d68d552d62c76c9be4a3)",
- "tm4c129x 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "walkdir 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tm4c129x 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -164,21 +148,12 @@ dependencies = [
  "typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "kernel32-sys"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "lexical-core"
-version = "0.6.1"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -214,18 +189,18 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "0.4.30"
+version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "quote"
-version = "0.6.13"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -264,11 +239,10 @@ dependencies = [
 
 [[package]]
 name = "same-file"
-version = "0.1.3"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -289,7 +263,7 @@ name = "smoltcp"
 version = "0.5.0"
 source = "git+https://github.com/m-labs/smoltcp.git?rev=8eb01aca364aefe5f823d68d552d62c76c9be4a3#8eb01aca364aefe5f823d68d552d62c76c9be4a3"
 dependencies = [
- "bitflags 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "managed 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -306,21 +280,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.15.44"
+version = "1.0.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "tm4c129x"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bare-metal 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "cortex-m 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cortex-m 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cortex-m-rt 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcell 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -332,7 +306,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "unicode-xid"
-version = "0.1.0"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -360,72 +334,88 @@ dependencies = [
 
 [[package]]
 name = "walkdir"
-version = "1.0.7"
+version = "2.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "same-file 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "same-file 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "winapi"
-version = "0.2.8"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "winapi-build"
-version = "0.1.1"
+name = "winapi-util"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
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 "checksum embedded-hal 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ee4908a155094da7723c2d60d617b820061e3b4efcc3d9e293d206a5a76c170b"
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 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
 "checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 "checksum smoltcp 0.5.0 (git+https://github.com/m-labs/smoltcp.git?rev=8eb01aca364aefe5f823d68d552d62c76c9be4a3)" = "<none>"
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diff --git a/firmware/Cargo.toml b/firmware/Cargo.toml
index a070dc3..3df7731 100644
--- a/firmware/Cargo.toml
+++ b/firmware/Cargo.toml
@@ -5,21 +5,21 @@ authors = ["whitequark <whitequark@whitequark.org>"]
 edition = "2018"
 
 [build-dependencies]
-walkdir = "1.0"
+walkdir = "~2"
 
 [dependencies]
 libm = "0.1.4"
-cortex-m = { version = "0.5", features = ["const-fn"] }
+cortex-m = { version = "0.6", features = ["const-fn"] }
 cortex-m-rt = "0.6"
-crc = { version = "1.7", default-features = false }
-tm4c129x = { version = "0.8", features = ["rt"] }
+crc = { version = "~1", default-features = false }
+tm4c129x = { version = "0.9", features = ["rt"] }
 embedded-hal = { version = "0.2", features = ["unproven"] }
 nb = "0.1"
 cortex-m-semihosting = "0.3"
 byteorder = { version = "1.3", default-features = false }
 bit_field = "0.10"
 bare-metal = "0.2"
-lexical-core = { version = "~0.6.1", default-features = false }
+lexical-core = { version = "~0.6", default-features = false }
 nom = { version = "~5", default-features = false }
 
 [dependencies.smoltcp]