diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ecf78fcf..f9f43a94 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [stable, nightly, '1.70.0']
+        toolchain: [stable, nightly, '1.73']
         platform:
           # Note: Make sure that we test all the `docs.rs` targets defined in Cargo.toml!
           - { name: 'Windows 64bit MSVC', target: x86_64-pc-windows-msvc,   os: windows-latest,  }
@@ -61,10 +61,10 @@ jobs:
           - { name: 'web',                target: wasm32-unknown-unknown,   os: ubuntu-latest,   }
         exclude:
           # Android is tested on stable-3
-          - toolchain: '1.70.0'
+          - toolchain: '1.73'
             platform: { name: 'Android', target: aarch64-linux-android, os: ubuntu-latest, options: '--package=winit --features=android-native-activity', cmd: 'apk --' }
         include:
-          - toolchain: '1.70.0'
+          - toolchain: '1.73'
             platform: { name: 'Android', target: aarch64-linux-android, os: ubuntu-latest, options: '--package=winit --features=android-native-activity', cmd: 'apk --' }
           - toolchain: 'nightly'
             platform: {
@@ -149,13 +149,13 @@ jobs:
     - name: Test dpi crate
       if: >
         contains(matrix.platform.name, 'Linux 64bit') &&
-        matrix.toolchain != '1.70.0'
+        matrix.toolchain != '1.73'
       run: cargo test -p dpi
 
     - name: Build tests
       if: >
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.70.0'
+        matrix.toolchain != '1.73'
       run: cargo $CMD test --no-run $OPTIONS
 
     - name: Run tests
@@ -164,7 +164,7 @@ jobs:
         !contains(matrix.platform.target, 'ios') &&
         !contains(matrix.platform.target, 'wasm32') &&
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.70.0'
+        matrix.toolchain != '1.73'
       run: cargo $CMD test $OPTIONS
 
     - name: Lint with clippy
@@ -174,7 +174,7 @@ jobs:
     - name: Build tests with serde enabled
       if: >
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.70.0'
+        matrix.toolchain != '1.73'
       run: cargo $CMD test --no-run $OPTIONS --features serde
 
     - name: Run tests with serde enabled
@@ -183,7 +183,7 @@ jobs:
         !contains(matrix.platform.target, 'ios') &&
         !contains(matrix.platform.target, 'wasm32') &&
         !contains(matrix.platform.target, 'redox') &&
-        matrix.toolchain != '1.70.0'
+        matrix.toolchain != '1.73'
       run: cargo $CMD test $OPTIONS --features serde
 
     - name: Check docs.rs documentation
diff --git a/Cargo.toml b/Cargo.toml
index 97b8924a..0dbd6c65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -346,7 +346,7 @@ resolver = "2"
 members = ["dpi"]
 
 [workspace.package]
-rust-version = "1.70.0"
+rust-version = "1.73"
 repository = "https://github.com/rust-windowing/winit"
 license = "Apache-2.0"
 edition = "2021"
diff --git a/README.md b/README.md
index 0b4af6e4..67c044c0 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ another library.
 
 ## MSRV Policy
 
-This crate's Minimum Supported Rust Version (MSRV) is **1.70**. Changes to
+This crate's Minimum Supported Rust Version (MSRV) is **1.73**. Changes to
 the MSRV will be accompanied by a minor version bump.
 
 As a **tentative** policy, the upper bound of the MSRV is given by the following
diff --git a/src/changelog/unreleased.md b/src/changelog/unreleased.md
index a0ac5e70..a86879a0 100644
--- a/src/changelog/unreleased.md
+++ b/src/changelog/unreleased.md
@@ -44,6 +44,7 @@ changelog entry.
 
 - On Web, let events wake up event loop immediately when using
   `ControlFlow::Poll`.
+- Bump MSRV from `1.70` to `1.73`.
 
 ### Removed
 
diff --git a/src/platform_impl/web/async/channel.rs b/src/platform_impl/web/async/channel.rs
index 42401a28..380b7cb8 100644
--- a/src/platform_impl/web/async/channel.rs
+++ b/src/platform_impl/web/async/channel.rs
@@ -1,8 +1,7 @@
 use std::future;
-use std::rc::Rc;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc::{self, RecvError, SendError, TryRecvError};
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use std::task::Poll;
 
 use super::AtomicWaker;
@@ -11,54 +10,35 @@ pub fn channel<T>() -> (Sender<T>, Receiver<T>) {
     let (sender, receiver) = mpsc::channel();
     let shared = Arc::new(Shared { closed: AtomicBool::new(false), waker: AtomicWaker::new() });
 
-    let sender =
-        Sender(Arc::new(SenderInner { sender: Mutex::new(sender), shared: Arc::clone(&shared) }));
-    let receiver = Receiver { receiver: Rc::new(receiver), shared };
+    let sender = Sender { sender, shared: Arc::clone(&shared) };
+    let receiver = Receiver { receiver, shared };
 
     (sender, receiver)
 }
 
-pub struct Sender<T>(Arc<SenderInner<T>>);
-
-struct SenderInner<T> {
-    // We need to wrap it into a `Mutex` to make it `Sync`. So the sender can't
-    // be accessed on the main thread, as it could block. Additionally we need
-    // to wrap `Sender` in an `Arc` to make it clonable on the main thread without
-    // having to block.
-    sender: Mutex<mpsc::Sender<T>>,
+pub struct Sender<T> {
+    sender: mpsc::Sender<T>,
     shared: Arc<Shared>,
 }
 
 impl<T> Sender<T> {
     pub fn send(&self, event: T) -> Result<(), SendError<T>> {
-        self.0.sender.lock().unwrap().send(event)?;
-        self.0.shared.waker.wake();
+        self.sender.send(event)?;
+        self.shared.waker.wake();
 
         Ok(())
     }
 }
 
-impl<T> SenderInner<T> {
-    fn close(&self) {
+impl<T> Drop for Sender<T> {
+    fn drop(&mut self) {
         self.shared.closed.store(true, Ordering::Relaxed);
         self.shared.waker.wake();
     }
 }
 
-impl<T> Clone for Sender<T> {
-    fn clone(&self) -> Self {
-        Self(Arc::clone(&self.0))
-    }
-}
-
-impl<T> Drop for SenderInner<T> {
-    fn drop(&mut self) {
-        self.close();
-    }
-}
-
 pub struct Receiver<T> {
-    receiver: Rc<mpsc::Receiver<T>>,
+    receiver: mpsc::Receiver<T>,
     shared: Arc<Shared>,
 }
 
@@ -95,18 +75,6 @@ impl<T> Receiver<T> {
     }
 }
 
-impl<T> Clone for Receiver<T> {
-    fn clone(&self) -> Self {
-        Self { receiver: Rc::clone(&self.receiver), shared: Arc::clone(&self.shared) }
-    }
-}
-
-impl<T> Drop for Receiver<T> {
-    fn drop(&mut self) {
-        self.shared.closed.store(true, Ordering::Relaxed);
-    }
-}
-
 struct Shared {
     closed: AtomicBool,
     waker: AtomicWaker,
diff --git a/src/platform_impl/web/async/dispatcher.rs b/src/platform_impl/web/async/dispatcher.rs
index 10ab345e..dffb04e9 100644
--- a/src/platform_impl/web/async/dispatcher.rs
+++ b/src/platform_impl/web/async/dispatcher.rs
@@ -1,9 +1,10 @@
 use super::super::main_thread::MainThreadMarker;
 use super::{channel, Receiver, Sender, Wrapper};
 use std::cell::Ref;
+use std::rc::Rc;
 use std::sync::{Arc, Condvar, Mutex};
 
-pub struct Dispatcher<T: 'static>(Wrapper<T, Sender<Closure<T>>, Closure<T>>);
+pub struct Dispatcher<T: 'static>(Wrapper<T, Arc<Sender<Closure<T>>>, Closure<T>>);
 
 struct Closure<T>(Box<dyn FnOnce(&T) + Send>);
 
@@ -11,6 +12,8 @@ impl<T> Dispatcher<T> {
     #[track_caller]
     pub fn new(main_thread: MainThreadMarker, value: T) -> Option<(Self, DispatchRunner<T>)> {
         let (sender, receiver) = channel::<Closure<T>>();
+        let sender = Arc::new(sender);
+        let receiver = Rc::new(receiver);
 
         Wrapper::new(
             main_thread,
@@ -21,7 +24,7 @@ impl<T> Dispatcher<T> {
                 closure(value.borrow().as_ref().unwrap())
             },
             {
-                let receiver = receiver.clone();
+                let receiver = Rc::clone(&receiver);
                 move |value| async move {
                     while let Ok(Closure(closure)) = receiver.next().await {
                         // SAFETY: The given `Closure` here isn't really `'static`, so we shouldn't
@@ -89,8 +92,8 @@ impl<T> Dispatcher<T> {
 }
 
 pub struct DispatchRunner<T: 'static> {
-    wrapper: Wrapper<T, Sender<Closure<T>>, Closure<T>>,
-    receiver: Receiver<Closure<T>>,
+    wrapper: Wrapper<T, Arc<Sender<Closure<T>>>, Closure<T>>,
+    receiver: Rc<Receiver<Closure<T>>>,
 }
 
 impl<T> DispatchRunner<T> {
diff --git a/src/platform_impl/web/web_sys/schedule.rs b/src/platform_impl/web/web_sys/schedule.rs
index c8b82b2e..a2ef874d 100644
--- a/src/platform_impl/web/web_sys/schedule.rs
+++ b/src/platform_impl/web/web_sys/schedule.rs
@@ -74,7 +74,7 @@ impl Schedule {
             let duration = duration
                 .as_secs()
                 .checked_mul(1000)
-                .and_then(|secs| secs.checked_add(duration_millis_ceil(duration).into()))
+                .and_then(|secs| secs.checked_add(duration.subsec_micros().div_ceil(1000).into()))
                 .unwrap_or(u64::MAX);
 
             options.delay(duration as f64);
@@ -127,7 +127,9 @@ impl Schedule {
                 .ok()
                 .and_then(|secs: i32| secs.checked_mul(1000))
                 .and_then(|secs: i32| {
-                    let millis: i32 = duration_millis_ceil(duration)
+                    let millis: i32 = duration
+                        .subsec_micros()
+                        .div_ceil(1000)
                         .try_into()
                         .expect("millis are somehow bigger then 1K");
                     secs.checked_add(millis)
@@ -169,20 +171,6 @@ impl Drop for Schedule {
     }
 }
 
-// TODO: Replace with `u32::div_ceil()` when we hit Rust v1.73.
-fn duration_millis_ceil(duration: Duration) -> u32 {
-    let micros = duration.subsec_micros();
-
-    // From <https://doc.rust-lang.org/1.73.0/src/core/num/uint_macros.rs.html#2086-2094>.
-    let d = micros / 1000;
-    let r = micros % 1000;
-    if r > 0 && 1000 > 0 {
-        d + 1
-    } else {
-        d
-    }
-}
-
 fn has_scheduler_support(window: &web_sys::Window) -> bool {
     thread_local! {
         static SCHEDULER_SUPPORT: OnceCell<bool> = const { OnceCell::new() };