diff --git a/cmd/brewcask-ci.rb b/cmd/brewcask-ci.rb
deleted file mode 100644
index 52b0d82ab9..0000000000
--- a/cmd/brewcask-ci.rb
+++ /dev/null
@@ -1,141 +0,0 @@
-# frozen_string_literal: true
-
-require "cask/cask_loader"
-require "cask/installer"
-
-require "utils/github"
-require "utils/formatter"
-
-require_relative "lib/check"
-require_relative "lib/ci_matrix"
-
-module Cask
-  class Cmd
-    class Ci < AbstractCommand
-      def self.description
-        "Test changes in a Homebrew Cask tap."
-      end
-
-      def run
-        odeprecated "brew cask ci", disable_on: Time.new(2020, 12, 31)
-
-        raise CaskError, "This command isn’t meant to be run locally." unless ENV.key?("CI")
-
-        tap = Tap.from_path(Dir.pwd)
-
-        matrix = CiMatrix.generate(tap)
-
-        $stdout.sync = true
-        $stderr.sync = true
-
-        overall_success = true
-
-        matrix.each do |m|
-          path = m[:cask][:path]
-
-          cask = CaskLoader.load(path)
-
-          overall_success &= step "brew cask style #{cask.token}" do
-            Style.run(cask.sourcefile_path)
-            true
-          end
-
-          overall_success &= step "brew cask audit #{cask.token}" do
-            Audit.run(*m[:audit_args], cask.sourcefile_path)
-            true
-          end
-
-          if (macos_requirement = cask.depends_on.macos) && !macos_requirement.satisfied?
-            opoo "Skipping installation: #{macos_requirement.message}"
-            next
-          end
-
-          was_installed = cask.installed?
-
-          installer = Installer.new(cask, verbose: true)
-
-          before = nil
-
-          cask_and_formula_dependencies = nil
-
-          overall_success &= step "brew cask install #{cask.token}" do
-            cask_and_formula_dependencies = installer.missing_cask_and_formula_dependencies
-
-            if was_installed
-              old_cask = CaskLoader.load(cask.installed_caskfile)
-              Installer.new(old_cask, verbose: true).zap
-            end
-
-            before = Check.all
-
-            installer.install
-          end
-
-          overall_success &= step "brew cask uninstall #{cask.token}" do
-            success = begin
-              if manual_installer?(cask)
-                puts "Cask has a manual installer, skipping..."
-              else
-                installer.uninstall
-              end
-              true
-            rescue => e
-              $stderr.puts e.message
-              $stderr.puts e.backtrace
-              false
-            ensure
-              cask_and_formula_dependencies.reverse_each do |cask_or_formula|
-                next unless cask_or_formula.is_a?(Cask)
-
-                Installer.new(cask_or_formula, verbose: true).uninstall if cask_or_formula.installed?
-              end
-            end
-
-            after = Check.all
-
-            errors = Check.errors(before, after, cask: cask)
-
-            next success if errors.empty?
-
-            errors.each do |error|
-              onoe error
-            end
-
-            false
-          end
-        end
-
-        if overall_success
-          puts Formatter.success("Build finished successfully.", label: "Success")
-          return
-        end
-
-        raise CaskError, "Build failed."
-      end
-
-      private
-
-      def step(name)
-        group = Formatter.headline(name.to_s, color: :yellow)
-
-        puts "::group::#{group}"
-
-        success = begin
-          yield != false
-        rescue => e
-          $stderr.puts e.message
-          $stderr.puts e.backtrace
-          false
-        end
-
-        puts "::endgroup::#{group}"
-
-        success
-      end
-
-      def manual_installer?(cask)
-        cask.artifacts.any? { |artifact| artifact.is_a?(Artifact::Installer::ManualInstaller) }
-      end
-    end
-  end
-end