diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84115670..42aac0ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- updated from edition 2018 to edition 2021
 - [breaking-change] `IndexMap` and `IndexSet` now require that keys implement the `core::hash::Hash`
   trait instead of the `hash32::Hash` (v0.2.0) trait
 - move `pool::singleton::Box` to the `pool::box` module
diff --git a/Cargo.toml b/Cargo.toml
index 0ec3c8d0..0a0c5b79 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ authors = [
 categories = ["data-structures", "no-std"]
 description = "`static` friendly data structures that don't require dynamic memory allocation"
 documentation = "https://docs.rs/heapless"
-edition = "2018"
+edition = "2021"
 keywords = ["static", "no-heap"]
 license = "MIT OR Apache-2.0"
 name = "heapless"
diff --git a/src/lib.rs b/src/lib.rs
index b6ca41ff..62282333 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -75,8 +75,6 @@
 
 #![cfg_attr(not(test), no_std)]
 #![deny(missing_docs)]
-#![deny(rust_2018_compatibility)]
-#![deny(rust_2018_idioms)]
 #![deny(warnings)]
 
 pub use binary_heap::BinaryHeap;
diff --git a/src/vec.rs b/src/vec.rs
index a77ba524..f7e4ae38 100644
--- a/src/vec.rs
+++ b/src/vec.rs
@@ -1,7 +1,4 @@
-use core::{
-    cmp::Ordering, convert::TryFrom, fmt, hash, iter::FromIterator, mem::MaybeUninit, ops, ptr,
-    slice,
-};
+use core::{cmp::Ordering, fmt, hash, iter::FromIterator, mem::MaybeUninit, ops, ptr, slice};
 
 /// A fixed capacity [`Vec`](https://doc.rust-lang.org/std/vec/struct.Vec.html)
 ///