diff --git a/CHANGELOG.md b/CHANGELOG.md
index 048b60e..8fcf928 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Unreleased
+
+- Update `criterion` to v0.6.
+- Update to `rust-version` 1.66.
+
 # Version 2.4.0
 
 - Make it so the `Exit` filter can be created without passing ownership of the
diff --git a/Cargo.toml b/Cargo.toml
index 277c53a..219b2aa 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,7 @@ name = "async-io"
 version = "2.4.0"
 authors = ["Stjepan Glavina <stjepang@gmail.com>"]
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.66"
 description = "Async I/O and timers"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/smol-rs/async-io"
@@ -44,7 +44,7 @@ windows-sys = { version = "0.59.0", features = ["Win32_Foundation"] }
 async-channel = "2.0.0"
 async-net = "2.0.0"
 blocking = "1"
-criterion = { version = "0.4", default-features = false, features = ["cargo_bench_support"] }
+criterion = { version = "0.6", default-features = false, features = ["cargo_bench_support"] }
 getrandom = "0.3"
 signal-hook = "0.3"
 tempfile = "3"
diff --git a/benches/io.rs b/benches/io.rs
index a0a1a65..4e3b480 100644
--- a/benches/io.rs
+++ b/benches/io.rs
@@ -1,8 +1,9 @@
 //! Benchmarks for a variety of I/O operations.
 
 use async_io::Async;
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 use futures_lite::{future, prelude::*};
+use std::hint::black_box;
 use std::net::{Ipv4Addr, SocketAddr, TcpListener, TcpStream, UdpSocket};
 
 /// Block on a future, either using the I/O driver or simple parking.
@@ -32,7 +33,7 @@ fn read_and_write(b: &mut Criterion) {
             (listener, reader, writer)
         };
 
-        group.bench_function(format!("TcpStream.{}", driver_name), move |b| {
+        group.bench_function(format!("TcpStream.{driver_name}"), move |b| {
             let (_listener, mut reader, mut writer) = init_reader_writer();
             let mut buf = vec![0x42; TCP_AMOUNT];
 
@@ -55,7 +56,7 @@ fn read_and_write(b: &mut Criterion) {
             use std::os::unix::net::UnixStream;
             const UNIX_AMOUNT: usize = 1024;
 
-            group.bench_function(format!("UnixStream.{}", driver_name), |b| {
+            group.bench_function(format!("UnixStream.{driver_name}"), |b| {
                 let (mut reader, mut writer) = Async::<UnixStream>::pair().unwrap();
                 let mut buf = vec![0x42; UNIX_AMOUNT];
 
@@ -79,7 +80,7 @@ fn connect_and_accept(c: &mut Criterion) {
 
     for (driver_name, exec) in [("Undriven", false), ("Driven", true)] {
         // Benchmark the TCP streams.
-        group.bench_function(format!("TcpStream.{}", driver_name), move |b| {
+        group.bench_function(format!("TcpStream.{driver_name}"), move |b| {
             let socket_addr =
                 SocketAddr::new("127.0.0.1".parse::<Ipv4Addr>().unwrap().into(), 12345);
             let listener = Async::<TcpListener>::bind(socket_addr).unwrap();
@@ -105,10 +106,10 @@ fn connect_and_accept(c: &mut Criterion) {
             getrandom::fill(&mut id).unwrap();
             let id = u64::from_ne_bytes(id);
 
-            let socket_addr = format!("/tmp/async-io-bench-{}.sock", id);
+            let socket_addr = format!("/tmp/async-io-bench-{id}.sock");
             let listener = Async::<UnixListener>::bind(&socket_addr).unwrap();
 
-            group.bench_function(format!("UnixStream.{}", driver_name), |b| {
+            group.bench_function(format!("UnixStream.{driver_name}"), |b| {
                 b.iter(|| {
                     block_on(
                         async {
@@ -142,7 +143,7 @@ fn udp_send_recv(c: &mut Criterion) {
     let mut buf = vec![0x42; UDP_AMOUNT];
 
     for (driver_name, exec) in [("Undriven", false), ("Driven", true)] {
-        group.bench_function(format!("UdpSocket.{}", driver_name), |b| {
+        group.bench_function(format!("UdpSocket.{driver_name}"), |b| {
             b.iter(|| {
                 let buf = &mut buf;
 
diff --git a/benches/timer.rs b/benches/timer.rs
index 54af9ff..99b472c 100644
--- a/benches/timer.rs
+++ b/benches/timer.rs
@@ -1,7 +1,9 @@
 //! Benchmarks for registering timers.
 
+use std::hint::black_box;
+
 use async_io::Timer;
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 use futures_lite::future;
 use std::time::Duration;
 
@@ -24,7 +26,7 @@ fn register_timer(c: &mut Criterion) {
 
         // Benchmark registering a timer.
         group.bench_function(
-            format!("register_timer.({} previous timers)", prev_timer_count),
+            format!("register_timer.({prev_timer_count} previous timers)"),
             |b| {
                 b.iter(|| {
                     let timer = make_timer();
diff --git a/examples/linux-inotify.rs b/examples/linux-inotify.rs
index 121b482..e2d89b2 100644
--- a/examples/linux-inotify.rs
+++ b/examples/linux-inotify.rs
@@ -52,7 +52,7 @@ fn main() -> std::io::Result<()> {
         // Wait for events in a loop and print them on the screen.
         loop {
             for event in unsafe { inotify.read_with_mut(read_op).await? } {
-                println!("{:?}", event);
+                println!("{event:?}");
             }
         }
     })