diff --git a/Cargo.lock b/Cargo.lock
index 446c095..2b7a5bc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -579,9 +579,9 @@ dependencies = [
 
 [[package]]
 name = "managed"
-version = "0.7.2"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c75de51135344a4f8ed3cfe2720dc27736f7711989703a0b43aadf3753c55577"
+checksum = "0ca88d725a0a943b096803bd34e73a4437208b6077654cc4ecb2947a5f91618d"
 
 [[package]]
 name = "matchers"
@@ -1046,12 +1046,14 @@ checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
 [[package]]
 name = "smoltcp"
-version = "0.7.5"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e4a069bef843d170df47e7c0a8bf8d037f217d9f5b325865acc3e466ffe40d3"
+checksum = "7e9786ac45091b96f946693e05bfa4d8ca93e2d3341237d97a380107a6b38dea"
 dependencies = [
  "bitflags",
  "byteorder",
+ "cfg-if",
+ "heapless",
  "managed",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 3b030d3..fc955bd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,7 @@ byte = "0.2.4"
 strum = { version = "0.24.0", default_features = false, features = [ "derive" ] }
 
 [dependencies.smoltcp]
-version = "0.7.1"
+version = "0.9.1"
 features = [ "proto-ipv6" ]
 default-features = false
 optional = true