diff --git a/.cirrus.yml b/.cirrus.yml
index b230cd5..aeedb60 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -2,7 +2,7 @@ test_task:
   name: cargo test 
   matrix:
     - container:
-       image: rust:1.31.0
+       image: rust:1.32.0
     - container:
        image: rust:latest
     - container:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc5d2b1..0a51726 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ### Added
 - Derived `Default` for `Mutex` and `RwLock`
   ([#22](/~https://github.com/asomers/futures-locks/pull/22))
+
+### Changed
+- Minimum compiler version has increased to 1.32.0
+  ([#28](/~https://github.com/asomers/futures-locks/pull/28))
   
 ## [0.4.0] - 2019-08-24
 ### Added
diff --git a/Cargo.toml b/Cargo.toml
index 300f7ab..dc67a02 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,6 @@
 [package]
 name = "futures-locks"
+edition = "2018"
 version = "0.4.1-pre"
 authors = ["Alan Somers <asomers@gmail.com>"]
 license = "MIT/Apache-2.0"
diff --git a/README.md b/README.md
index f4388ed..e259631 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ standard library.  But instead of blocking until ready, they return Futures
 which will become ready when the lock is acquired.  See the doc comments for
 individual examples.
 
-`futures-locks` requires Rust 1.31.0 or higher.
+`futures-locks` requires Rust 1.32.0 or higher.
 
 # License
 
diff --git a/src/lib.rs b/src/lib.rs
index ae85836..43d163f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,8 +11,6 @@
 //! # Examples
 //!
 //! ```
-//! # extern crate futures;
-//! # extern crate futures_locks;
 //! # use futures_locks::*;
 //! # use futures::executor::{Spawn, spawn};
 //! # use futures::Future;
@@ -29,10 +27,6 @@
 
 #![cfg_attr(feature = "nightly-docs", feature(doc_cfg))]
 
-extern crate futures;
-#[cfg(feature = "tokio")] extern crate tokio_current_thread;
-#[cfg(feature = "tokio")] extern crate tokio_executor;
-
 mod mutex;
 mod rwlock;
 
diff --git a/src/mutex.rs b/src/mutex.rs
index c32ef4d..91af2ab 100644
--- a/src/mutex.rs
+++ b/src/mutex.rs
@@ -1,14 +1,15 @@
 // vim: tw=80
 
-use futures::{Async, Future, Poll};
+use futures::{Async, Future, Poll, sync::oneshot};
 #[cfg(feature = "tokio")] use futures::future;
 #[cfg(feature = "tokio")] use futures::future::IntoFuture;
-use futures::sync::oneshot;
-use std::cell::UnsafeCell;
-use std::clone::Clone;
-use std::collections::VecDeque;
-use std::ops::{Deref, DerefMut};
-use std::sync;
+use std::{
+    cell::UnsafeCell,
+    clone::Clone,
+    collections::VecDeque,
+    ops::{Deref, DerefMut},
+    sync
+};
 use super::FutState;
 #[cfg(feature = "tokio")] use tokio_executor::{self, Executor, SpawnError};
 #[cfg(feature = "tokio")] use tokio_current_thread as current_thread;
@@ -193,8 +194,6 @@ unsafe impl<T: ?Sized + Send> Sync for MutexWeak<T> {}
 /// # Examples
 ///
 /// ```
-/// # extern crate futures;
-/// # extern crate futures_locks;
 /// # use futures_locks::*;
 /// # use futures::executor::{Spawn, spawn};
 /// # use futures::Future;
@@ -265,7 +264,6 @@ impl<T: ?Sized> Mutex<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # fn main() {
     /// let mut mtx = Mutex::<u32>::new(0);
@@ -298,7 +296,6 @@ impl<T: ?Sized> Mutex<T> {
     ///
     /// # Examples
     /// ```
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # fn main() {
     /// let mut mtx = Mutex::<u32>::new(0);
@@ -353,8 +350,6 @@ impl<T: 'static + ?Sized> Mutex<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
@@ -405,8 +400,6 @@ impl<T: 'static + ?Sized> Mutex<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
diff --git a/src/rwlock.rs b/src/rwlock.rs
index 1f7a68e..b335135 100644
--- a/src/rwlock.rs
+++ b/src/rwlock.rs
@@ -1,14 +1,15 @@
 // vim: tw=80
 
-use futures::{Async, Future, Poll};
+use futures::{Async, Future, Poll, sync::oneshot};
 #[cfg(feature = "tokio")] use futures::future;
 #[cfg(feature = "tokio")] use futures::future::IntoFuture;
-use futures::sync::oneshot;
-use std::cell::UnsafeCell;
-use std::clone::Clone;
-use std::collections::VecDeque;
-use std::ops::{Deref, DerefMut};
-use std::sync;
+use std::{
+    cell::UnsafeCell,
+    clone::Clone,
+    collections::VecDeque,
+    ops::{Deref, DerefMut},
+    sync,
+};
 use super::FutState;
 #[cfg(feature = "tokio")] use tokio_executor::{self, Executor, SpawnError};
 #[cfg(feature = "tokio")] use tokio_current_thread as current_thread;
@@ -319,7 +320,6 @@ impl<T: ?Sized> RwLock<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # fn main() {
     /// let mut lock = RwLock::<u32>::new(0);
@@ -347,8 +347,6 @@ impl<T: ?Sized> RwLock<T> {
     ///
     /// # Examples
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # use futures::executor::{Spawn, spawn};
     /// # use futures::Future;
@@ -371,8 +369,6 @@ impl<T: ?Sized> RwLock<T> {
     ///
     /// # Examples
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # use futures::executor::{Spawn, spawn};
     /// # use futures::Future;
@@ -395,7 +391,6 @@ impl<T: ?Sized> RwLock<T> {
     ///
     /// # Examples
     /// ```
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # fn main() {
     /// let mut lock = RwLock::<u32>::new(5);
@@ -423,7 +418,6 @@ impl<T: ?Sized> RwLock<T> {
     ///
     /// # Examples
     /// ```
-    /// # extern crate futures_locks;
     /// # use futures_locks::*;
     /// # fn main() {
     /// let mut lock = RwLock::<u32>::new(5);
@@ -494,8 +488,6 @@ impl<T: 'static + ?Sized> RwLock<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
@@ -545,8 +537,6 @@ impl<T: 'static + ?Sized> RwLock<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
@@ -605,8 +595,6 @@ impl<T: 'static + ?Sized> RwLock<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
@@ -658,8 +646,6 @@ impl<T: 'static + ?Sized> RwLock<T> {
     /// # Examples
     ///
     /// ```
-    /// # extern crate futures;
-    /// # extern crate futures_locks;
     /// # extern crate tokio_ as tokio;
     /// # use futures_locks::*;
     /// # use futures::{Future, IntoFuture, lazy};
diff --git a/tests/test.rs b/tests/test.rs
index 7e1f513..76d60f8 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -1,8 +1,6 @@
 //vim: tw=80
 
-extern crate futures;
 extern crate tokio_ as tokio;
-extern crate futures_locks;
 
 mod mutex;
 mod rwlock;