diff --git a/Casks/o/onyx.rb b/Casks/o/onyx.rb
index f1b132834f..599ea15281 100644
--- a/Casks/o/onyx.rb
+++ b/Casks/o/onyx.rb
@@ -42,7 +42,7 @@ cask "onyx" do
     url "https://www.titanium-software.fr/download/13/OnyX.dmg"
   end
   on_sonoma :or_newer do
-    version "4.5.5"
+    version "4.5.6"
 
     url "https://www.titanium-software.fr/download/14/OnyX.dmg"
   end