diff --git a/update-on-ox b/update-on-ox
index 7c44a4997..f09ff88dc 100755
--- a/update-on-ox
+++ b/update-on-ox
@@ -15,7 +15,7 @@ if False:
     dmg = sys.argv[-1]
     mp = tempfile.mkdtemp()
     atexit.register(os.rmdir, mp)
-    subprocess.check_call(f'hdiutil attach {dmg} -mountpoint {mp}'.split())
+    subprocess.check_call(f'diskutil image attach --mountPoint {mp} {dmg}'.split())
     try:
         os.chdir(mp)
         for app in glob.glob('*.app'):
@@ -25,7 +25,7 @@ if False:
             subprocess.check_call(f'ditto -v {app} {d}'.split())
     finally:
         os.chdir('/')
-        subprocess.check_call(f'hdiutil detach {mp}'.split())
+        subprocess.check_call(f'diskutil eject {mp}'.split())
 
 # EOF_REMOTE