diff --git a/Casks/unity523.rb b/Casks/unity523.rb
deleted file mode 100644
index 9c4145c5e..000000000
--- a/Casks/unity523.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-cask 'unity523' do
-  version '5.2.3f1'
-  sha256 'a2cf141409078a8e1934a0dede357578580e318c21275696b57346acbcbd284c'
-
-  url "http://download.unity3d.com/download_unity/f3d16a1fa2dd/MacEditorInstaller/Unity-#{version}.pkg"
-  name 'Unity Editor'
-  homepage 'https://unity3d.com/unity/'
-
-  pkg "Unity-#{version}.pkg"
-
-  uninstall quit:    'com.unity3d.UnityEditor5.x',
-            pkgutil: 'com.unity3d.UnityEditor5.x'
-end