diff --git a/Casks/acorn5.rb b/Casks/acorn5.rb
new file mode 100644
index 000000000..94d1b8f52
--- /dev/null
+++ b/Casks/acorn5.rb
@@ -0,0 +1,14 @@
+cask 'acorn5' do
+  version '5.6.6'
+  sha256 '2fda93b116ae910643e1383bf425cf30fa8c09e01edffc41730ee19594cff561'
+
+  url "https://secure.flyingmeat.com/download/Acorn-#{version}.zip"
+  appcast "https://secure.flyingmeat.com/download/acorn#{version.major}update.xml",
+          checkpoint: '740a11ba7dd12a8d5f34d558f47913f25d50a9fb81c0496a6e7d03a940de15fb'
+  name 'Acorn'
+  homepage 'https://flyingmeat.com/acorn/'
+
+  auto_updates true
+
+  app 'Acorn.app'
+end