diff --git a/Cargo.lock b/Cargo.lock
index 355cd61..608f1bc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -20,9 +20,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "cortex-a"
-version = "4.1.0"
+version = "5.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a389514c1229e12a03c0e8de8b357671b71e1d1bdab3a4f5b591abc94169cba8"
+checksum = "626fdbb0f6fa1e6be6df0e94795998894c4ad08d3221e12209a6c0b4f546a0c4"
 dependencies = [
  "register",
 ]
@@ -65,9 +65,9 @@ checksum = "bd7a31eed1591dcbc95d92ad7161908e72f4677f8fabf2a32ca49b4237cbf211"
 
 [[package]]
 name = "register"
-version = "0.5.1"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "deaba5b0e477d21f61a57504bb5cef4a1e86de30300b457d38971c1cfc98b815"
+checksum = "185fff3cbc031a1d17b86a980f8014002da35f9187cf4370728e0eb1eeff6829"
 dependencies = [
  "tock-registers",
 ]
@@ -106,9 +106,9 @@ dependencies = [
 
 [[package]]
 name = "tock-registers"
-version = "0.5.0"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70323afdb8082186c0986da0e10f6e4ed103d681c921c00597e98d9806dac20f"
+checksum = "f521a79accce68c417c9c77ce22108056b626126da1932f7e2e9b5bbffee0cea"
 
 [[package]]
 name = "unicode-xid"
diff --git a/nucleus/Cargo.toml b/nucleus/Cargo.toml
index d369e52..0aebca7 100644
--- a/nucleus/Cargo.toml
+++ b/nucleus/Cargo.toml
@@ -26,11 +26,11 @@ qemu = ["qemu-exit"]
 [dependencies]
 r0 = "1.0"
 qemu-exit = { version = "1.0", optional = true }
-cortex-a = "4.1.0"
+cortex-a = "5.0"
+register = "1.0"
 ux = { version = "0.1.3", default-features = false }
 usize_conversions = "0.2.0"
 bit_field = "0.10.0"
-register = "0.5.1"
 bitflags = "1.2.1"
 cfg-if = "1.0"
 snafu = { version = "0.6", default-features = false }