diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
index 30970c371..5d391698c 100644
--- a/embassy-net/Cargo.toml
+++ b/embassy-net/Cargo.toml
@@ -25,7 +25,7 @@ log = { version = "0.4.11", optional = true }
 embassy             = { version = "0.1.0", path = "../embassy" }
 
 managed             = { version = "0.8.0", default-features = false, features = [ "map" ]}
-heapless            = { version = "0.5.6", default-features = false } 
+heapless            = { version = "0.7.1", default-features = false }
 as-slice            = { version = "0.1.4" }
 generic-array       = { version = "0.14.4", default-features = false }
 stable_deref_trait  = { version = "1.2.0", default-features = false }
diff --git a/embassy-net/src/config/mod.rs b/embassy-net/src/config/mod.rs
index 16470f7e6..94725dba6 100644
--- a/embassy-net/src/config/mod.rs
+++ b/embassy-net/src/config/mod.rs
@@ -1,4 +1,3 @@
-use heapless::consts::*;
 use heapless::Vec;
 use smoltcp::time::Instant;
 use smoltcp::wire::{Ipv4Address, Ipv4Cidr};
@@ -29,7 +28,7 @@ pub enum Event {
 pub struct Config {
     pub address: Ipv4Cidr,
     pub gateway: Option<Ipv4Address>,
-    pub dns_servers: Vec<Ipv4Address, U3>,
+    pub dns_servers: Vec<Ipv4Address, 3>,
 }
 
 pub trait Configurator {
diff --git a/examples/std/Cargo.toml b/examples/std/Cargo.toml
index 04e89269d..22ffc8937 100644
--- a/examples/std/Cargo.toml
+++ b/examples/std/Cargo.toml
@@ -18,4 +18,4 @@ nix = "0.21.0"
 libc = "0.2.81"
 clap = { version = "3.0.0-beta.2", features = ["derive"] }
 rand_core   = { version = "0.6.0", features = ["std"] }
-heapless            = { version = "0.5.6", default-features = false } 
+heapless            = { version = "0.7.1", default-features = false }
diff --git a/examples/stm32f4/Cargo.toml b/examples/stm32f4/Cargo.toml
index c5c8d9ae6..2c16af5fb 100644
--- a/examples/stm32f4/Cargo.toml
+++ b/examples/stm32f4/Cargo.toml
@@ -32,4 +32,4 @@ embedded-hal    = { version = "0.2.4" }
 panic-probe = { version = "0.2.0", features= ["print-defmt"] }
 futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
 rtt-target = { version = "0.3", features = ["cortex-m"] }
-heapless = "0.7"
\ No newline at end of file
+heapless            = { version = "0.7.1", default-features = false }
\ No newline at end of file