diff --git a/Cargo.lock b/Cargo.lock
index e44482c..6133b9e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -81,7 +81,7 @@ dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.31 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -308,7 +308,7 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "0.15.30"
+version = "0.15.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -442,7 +442,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c4488ae950c49d403731982257768f48fada354a5203fe81f9bb6f43ca9002be"
 "checksum smoltcp 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fef582369edb298c6c41319a544ca9c4e83622f226055ccfcb35974fbb55ed34"
 "checksum stm32h7 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a2756cb97ac50836393814072493107a42701fecd11a6d228527292479bb1f25"
-"checksum syn 0.15.30 (registry+https://github.com/rust-lang/crates.io-index)" = "66c8865bf5a7cbb662d8b011950060b3c8743dca141b054bf7195b20d314d8e2"
+"checksum syn 0.15.31 (registry+https://github.com/rust-lang/crates.io-index)" = "d2b4cfac95805274c6afdb12d8f770fa2d27c045953e7b630a81801953699a9a"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
diff --git a/Cargo.toml b/Cargo.toml
index a2a7108..1e12749 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,7 +35,7 @@ stm32h7 = { version = "0.6", features = ["stm32h7x3", "rt"] }
 log = "0.4"
 panic-abort = "0.3"
 panic-semihosting = { version = "0.5", optional = true }
-smoltcp = { version = "0.5.0", default-features = false, features = ["proto-ipv4", "socket-tcp", "log"] }
+smoltcp = { version = "0.5", default-features = false, features = ["proto-ipv4", "socket-tcp", "log"] }
 
 [features]
 semihosting = ["panic-semihosting", "cortex-m-log/semihosting"]