diff --git a/Cargo.lock b/Cargo.lock
index 2a93243f..77f68150 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3463,7 +3463,7 @@ dependencies = [
  "parking_lot",
  "signal-hook",
  "tracing",
- "windows-sys 0.48.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
diff --git a/teletypewriter/Cargo.toml b/teletypewriter/Cargo.toml
index 4b7e9b0d..414d5b12 100644
--- a/teletypewriter/Cargo.toml
+++ b/teletypewriter/Cargo.toml
@@ -19,7 +19,7 @@ signal-hook = "0.3.17"
 iovec = { workspace = true }
 
 [target.'cfg(windows)'.dependencies]
-windows-sys = { version = "0.48", features = [
+windows-sys = { version = "0.59", features = [
     "Win32_System_Console",
     "Win32_Foundation",
     "Win32_Security",
diff --git a/teletypewriter/src/windows/child.rs b/teletypewriter/src/windows/child.rs
index cd214e56..333eb5d0 100644
--- a/teletypewriter/src/windows/child.rs
+++ b/teletypewriter/src/windows/child.rs
@@ -29,11 +29,16 @@ pub struct ChildExitWatcher {
     pid: Option<NonZeroU32>,
 }
 
+// HANDLE is not Send, so Send is not derived automatically for ChildExitWatcher, but raw pointers
+// are generally safe to send between threads as long as the type they deference to is Send, which
+// c_void is. (see https://doc.rust-lang.org/nomicon/send-and-sync.html).
+unsafe impl Send for ChildExitWatcher {}
+
 impl ChildExitWatcher {
     pub fn new(child_handle: HANDLE) -> Result<ChildExitWatcher, Error> {
         let (event_tx, event_rx) = channel::<ChildEvent>();
 
-        let mut wait_handle: HANDLE = 0;
+        let mut wait_handle: HANDLE = std::ptr::null_mut();
         let sender_ref = Box::new(event_tx);
 
         let success = unsafe {
diff --git a/teletypewriter/src/windows/conpty.rs b/teletypewriter/src/windows/conpty.rs
index 004071ab..bb80f655 100644
--- a/teletypewriter/src/windows/conpty.rs
+++ b/teletypewriter/src/windows/conpty.rs
@@ -68,7 +68,7 @@ impl ConptyApi {
         type LoadedFn = unsafe extern "system" fn() -> isize;
         unsafe {
             let hmodule = LoadLibraryW(w!("conpty.dll"));
-            if hmodule == 0 {
+            if hmodule.is_null() {
                 return None;
             }
             let create_fn = GetProcAddress(hmodule, s!("CreatePseudoConsole"))?;
diff --git a/teletypewriter/src/windows/pipes.rs b/teletypewriter/src/windows/pipes.rs
index f877a6e8..8253b6d6 100644
--- a/teletypewriter/src/windows/pipes.rs
+++ b/teletypewriter/src/windows/pipes.rs
@@ -201,7 +201,7 @@ impl Drop for EventedAnonRead {
 
         // Stop reader thread waiting for pipe contents
         unsafe {
-            CancelSynchronousIo(thread.as_raw_handle() as isize);
+            CancelSynchronousIo(thread.as_raw_handle());
         }
 
         thread