diff --git a/Cargo.lock b/Cargo.lock
index 3a5250f..d96d01c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -293,7 +293,7 @@ dependencies = [
 [[package]]
 name = "smoltcp"
 version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/m-labs/smoltcp.git?rev=8eb01ac#8eb01aca364aefe5f823d68d552d62c76c9be4a3"
 dependencies = [
  "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)",
@@ -314,7 +314,7 @@ dependencies = [
  "panic-semihosting 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde-json-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smoltcp 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smoltcp 0.5.0 (git+https://github.com/m-labs/smoltcp.git?rev=8eb01ac)",
  "stm32h7 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -405,7 +405,7 @@ dependencies = [
 "checksum serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)" = "0c4b39bd9b0b087684013a792c59e3e07a46a01d2322518d8a1104641a0b1be0"
 "checksum serde-json-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf406405ada9ef326ca78677324ac66994ff348fc48a16030be08caeed29825"
 "checksum serde_derive 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)" = "ca13fc1a832f793322228923fbb3aba9f3f44444898f835d31ad1b74fa0a2bf8"
-"checksum smoltcp 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fef582369edb298c6c41319a544ca9c4e83622f226055ccfcb35974fbb55ed34"
+"checksum smoltcp 0.5.0 (git+https://github.com/m-labs/smoltcp.git?rev=8eb01ac)" = "<none>"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
 "checksum stm32h7 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6fd678579307324f1890552fe644331ce0a46607f2466aac8609f782d9b26524"
 "checksum syn 1.0.8 (registry+https://github.com/rust-lang/crates.io-index)" = "661641ea2aa15845cddeb97dad000d22070bb5c1fb456b96c1cba883ec691e92"