diff --git a/Cargo.toml b/Cargo.toml
index 13e047c..66bc36a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ mach = "0.3"
 libc = "0.2"
 
 [target.'cfg(target_os = "windows")'.dependencies.windows-sys]
-version = "0.52"
+version = "0.59"
 features = [
     "Win32_Foundation",
     "Win32_System_LibraryLoader",
diff --git a/src/rt_win.rs b/src/rt_win.rs
index 480c5bd..80892fa 100644
--- a/src/rt_win.rs
+++ b/src/rt_win.rs
@@ -70,7 +70,7 @@ pub fn demote_current_thread_from_real_time_internal(
 
 mod avrt_lib {
     use super::win32_utils::{win32_error_if, OwnedLibrary};
-    use std::sync::Once;
+    use std::{ptr::null_mut, sync::Once};
     use windows_sys::{
         core::PCWSTR,
         s, w,
@@ -135,7 +135,7 @@ mod avrt_lib {
             let task_handle = unsafe {
                 (self.av_set_mm_thread_characteristics_w)(task_name, &mut mmcss_task_index)
             };
-            win32_error_if(task_handle == 0)?;
+            win32_error_if(task_handle == null_mut())?;
             Ok((mmcss_task_index, task_handle))
         }
 
@@ -150,6 +150,8 @@ mod avrt_lib {
 }
 
 mod win32_utils {
+    use std::ptr::null_mut;
+
     use windows_sys::{
         core::{PCSTR, PCWSTR},
         Win32::{
@@ -172,7 +174,7 @@ mod win32_utils {
     impl OwnedLibrary {
         pub(super) fn try_new(lib_file_name: PCWSTR) -> Result<Self, WIN32_ERROR> {
             let module = unsafe { LoadLibraryW(lib_file_name) };
-            win32_error_if(module == 0)?;
+            win32_error_if(module == null_mut())?;
             Ok(Self(module))
         }
 
@@ -199,6 +201,9 @@ mod win32_utils {
             }
         }
     }
+
+    unsafe impl Send for OwnedLibrary {}
+    unsafe impl Sync for OwnedLibrary {}
 }
 
 #[cfg(test)]