diff --git a/Cargo.toml b/Cargo.toml
index 174936f4..022c0fd3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,9 +24,9 @@ objc = "0.2"
 [target.'cfg(target_os = "macos")'.dependencies]
 objc = "0.2"
 cgl = "0.2"
-cocoa = "=0.5.2"
-core-foundation = "0.2"
-core-graphics = "0.4"
+cocoa = "0.9"
+core-foundation = "0.4"
+core-graphics = "0.8"
 
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = "0.2"
diff --git a/src/platform/ios/ffi.rs b/src/platform/ios/ffi.rs
index 42a946d9..cadc5623 100644
--- a/src/platform/ios/ffi.rs
+++ b/src/platform/ios/ffi.rs
@@ -66,7 +66,7 @@ extern {
     pub fn longjmp(env: *mut libc::c_void, val: libc::c_int);
 }
 
-pub trait NSString {
+pub trait NSString: Sized {
     unsafe fn alloc(_: Self) -> id {
         msg_send![class("NSString"), alloc]
     }
diff --git a/src/platform/macos/window.rs b/src/platform/macos/window.rs
index 8ea04a76..cbd66056 100644
--- a/src/platform/macos/window.rs
+++ b/src/platform/macos/window.rs
@@ -338,21 +338,17 @@ impl Window {
 
             let masks = if screen.is_some() {
                 // Fullscreen window
-                appkit::NSBorderlessWindowMask as NSUInteger |
-                appkit::NSResizableWindowMask as NSUInteger |
-                appkit::NSTitledWindowMask as NSUInteger
+                appkit::NSBorderlessWindowMask | appkit::NSResizableWindowMask |
+                    appkit::NSTitledWindowMask
             } else if attrs.decorations {
                 // Window with a titlebar
-                appkit::NSClosableWindowMask as NSUInteger |
-                appkit::NSMiniaturizableWindowMask as NSUInteger |
-                appkit::NSResizableWindowMask as NSUInteger |
-                appkit::NSTitledWindowMask as NSUInteger
+                appkit::NSClosableWindowMask | appkit::NSMiniaturizableWindowMask |
+                    appkit::NSResizableWindowMask | appkit::NSTitledWindowMask
             } else {
                 // Window without a titlebar
-                appkit::NSClosableWindowMask as NSUInteger |
-                appkit::NSMiniaturizableWindowMask as NSUInteger |
-                appkit::NSResizableWindowMask as NSUInteger |
-                appkit::NSFullSizeContentViewWindowMask as NSUInteger
+                appkit::NSClosableWindowMask | appkit::NSMiniaturizableWindowMask |
+                    appkit::NSResizableWindowMask |
+                    appkit::NSFullSizeContentViewWindowMask
             };
 
             let window = IdRef::new(NSWindow::alloc(nil).initWithContentRect_styleMask_backing_defer_(