diff --git a/Casks/a/aquaterm.rb b/Casks/a/aquaterm.rb
index 69923a4b36..53abf5cf88 100644
--- a/Casks/a/aquaterm.rb
+++ b/Casks/a/aquaterm.rb
@@ -7,6 +7,9 @@ cask "aquaterm" do
   desc "Graphics renderer"
   homepage "https://sourceforge.net/projects/aquaterm/"
 
+  # No releases since 2013
+  deprecate! date: "2024-01-04", because: :unmaintained
+
   depends_on macos: ">= :high_sierra"
 
   pkg "AquaTermInstaller.pkg"