diff --git a/Capfile b/Capfile
deleted file mode 100644
index 9d7f1f7e8..000000000
--- a/Capfile
+++ /dev/null
@@ -1,21 +0,0 @@
-# Load DSL and set up stages
-require 'capistrano/setup'
-
-# Include default deployment tasks
-require 'capistrano/deploy'
-
-require "capistrano/scm/git"
-install_plugin Capistrano::SCM::Git
-
-# Include tasks from other gems included in your Gemfile
-require 'capistrano/rbenv'
-require 'capistrano/rails'
-require 'capistrano3/unicorn'
-require 'capistrano/deploytags'
-require 'new_relic/recipes'
-
-# Load custom tasks from `lib/capistrano/tasks` if you have any defined
-Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
-
-# workaround for https://github.com/capistrano/rails/issues/235
-Rake::Task["deploy:assets:backup_manifest"].clear_actions
diff --git a/Gemfile b/Gemfile
index 030fe6d19..1f9a93e5d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -12,9 +12,6 @@ gem 'ruby-vips'
 gem 'net-sftp'
 gem 'diff-lcs', :require => "diff/lcs/array"
 gem 'bcrypt', :require => "bcrypt"
-gem 'capistrano', '~> 3.10'
-gem 'capistrano-rails'
-gem 'capistrano-rbenv'
 gem 'rubyzip', :require => "zip"
 gem 'stripe'
 gem 'aws-sdk-sqs', '~> 1'
@@ -59,12 +56,10 @@ gem "parallel"
 
 group :production do
   gem 'unicorn', :platforms => :ruby
-  gem 'capistrano3-unicorn'
 end
 
 group :production do
   gem 'unicorn-worker-killer'
-  gem 'capistrano-deploytags', '~> 1.0.0', require: false
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index c86bbbafd..915c0bee8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,8 +83,6 @@ GEM
       zeitwerk (~> 2.3)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
-    airbrussh (1.4.0)
-      sshkit (>= 1.6.1, != 1.7.0)
     ansi (1.5.0)
     ast (2.4.2)
     aws-eventstream (1.2.0)
@@ -114,23 +112,6 @@ GEM
       msgpack (~> 1.0)
     builder (3.2.4)
     byebug (11.1.3)
-    capistrano (3.16.0)
-      airbrussh (>= 1.0.0)
-      i18n
-      rake (>= 10.0.0)
-      sshkit (>= 1.9.0)
-    capistrano-bundler (2.0.1)
-      capistrano (~> 3.1)
-    capistrano-deploytags (1.0.7)
-      capistrano (>= 3.7.0)
-    capistrano-rails (1.6.1)
-      capistrano (~> 3.1)
-      capistrano-bundler (>= 1.1, < 3)
-    capistrano-rbenv (2.2.0)
-      capistrano (~> 3.1)
-      sshkit (~> 1.3)
-    capistrano3-unicorn (0.2.1)
-      capistrano (~> 3.1, >= 3.1.0)
     capybara (3.35.3)
       addressable
       mini_mime (>= 0.1.3)
@@ -294,8 +275,6 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    net-scp (3.0.0)
-      net-ssh (>= 2.6.5, < 7.0.0)
     net-sftp (3.0.0)
       net-ssh (>= 5.0.0, < 7.0.0)
     net-ssh (6.1.0)
@@ -461,9 +440,6 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sshkit (1.21.2)
-      net-scp (>= 1.1.2)
-      net-ssh (>= 2.8.0)
     stackprof (0.2.17)
     stripe (5.38.0)
     stripe-ruby-mock (3.0.1)
@@ -522,11 +498,6 @@ DEPENDENCIES
   binding_of_caller
   bootsnap
   builder
-  capistrano (~> 3.10)
-  capistrano-deploytags (~> 1.0.0)
-  capistrano-rails
-  capistrano-rbenv
-  capistrano3-unicorn
   capybara
   clockwork
   codecov
diff --git a/bin/cap b/bin/cap
deleted file mode 100755
index db774dc52..000000000
--- a/bin/cap
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-#
-# This file was generated by Bundler.
-#
-# The application 'cap' is installed as part of a gem, and
-# this file is here to facilitate running it.
-#
-
-require "pathname"
-ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
-  Pathname.new(__FILE__).realpath)
-
-bundle_binstub = File.expand_path("../bundle", __FILE__)
-
-if File.file?(bundle_binstub)
-  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
-    load(bundle_binstub)
-  else
-    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
-Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
-  end
-end
-
-require "rubygems"
-require "bundler/setup"
-
-load Gem.bin_path("capistrano", "cap")
diff --git a/config/deploy.rb b/config/deploy.rb
deleted file mode 100644
index 129ad66f8..000000000
--- a/config/deploy.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# This file contains configuration settings for deploying Danbooru to the
-# production servers using Capistrano. This is only used by production and
-# shouldn't be edited by end users.
-#
-# @see Capfile
-# @see config/deploy
-# @see lib/capistrano/tasks
-# @see https://capistranorb.com
-
-set :stages, %w(production test)
-set :default_stage, "test"
-set :application, "danbooru"
-set :repo_url,  "git://github.com/danbooru/danbooru.git"
-set :deploy_to, "/var/www/danbooru2"
-append :linked_dirs, "log", "tmp/pids", "tmp/cache", "tmp/sockets", "vendor/bundle"
-set :branch, ENV.fetch("branch", "master")
-
-# skip migrations if files in db/migrate weren't modified
-set :conditionally_migrate, true
-
-# run migrations on the primary app server
-set :migration_role, :app
-
-set :whenever_roles, :cron
-
-# how long unicorn:legacy_restart (used by deploy:rolling) waits until killing the old unicorn.
-set :unicorn_restart_sleep_time, 10
diff --git a/config/deploy/README.md b/config/deploy/README.md
deleted file mode 100644
index f66473942..000000000
--- a/config/deploy/README.md
+++ /dev/null
@@ -1,14 +0,0 @@
-# Deploy
-
-This directory contains configuration settings for deploying Danbooru to the production servers
-using Capistrano. This is only used by production and shouldn't be edited by end users.
-
-# See also
-
-* [Capfile](../../Capfile)
-* [config/deploy.rb](../deploy.rb)
-* [lib/capistrano/tasks](../../lib/capistrano/tasks)
-
-# External links
-
-* https://capistranorb.com
\ No newline at end of file
diff --git a/config/deploy/development.rb b/config/deploy/development.rb
deleted file mode 100644
index 45d40abd5..000000000
--- a/config/deploy/development.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-set :user, "danbooru"
-set :rails_env, "development"
-server "localhost", :roles => %w(web app db), :primary => true, :user => "danbooru"
diff --git a/config/deploy/production.rb b/config/deploy/production.rb
deleted file mode 100644
index a2fa7ac5c..000000000
--- a/config/deploy/production.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-set :user, "danbooru"
-set :rails_env, "production"
-set :delayed_job_workers, 8
-append :linked_files, ".env.production"
-
-server "kagamihara", :roles => %w(web app cron), :primary => true
-server "shima", :roles => %w(web app)
-server "saitou", :roles => %w(web app)
-server "oogaki", :roles => %w(worker)
-
-set :newrelic_appname, "Danbooru"
-after "deploy:finished", "newrelic:notice_deployment"
diff --git a/lib/capistrano/tasks/app.rake b/lib/capistrano/tasks/app.rake
deleted file mode 100644
index 304136a54..000000000
--- a/lib/capistrano/tasks/app.rake
+++ /dev/null
@@ -1,35 +0,0 @@
-namespace :app do
-  set :rolling_deploy, false
-
-  task :disable do
-    if fetch(:rolling_deploy)
-      # do nothing
-    else
-      invoke "web:disable"
-      invoke "unicorn:stop"
-    end
-  end
-
-  task :enable do
-    if fetch(:rolling_deploy)
-      invoke "unicorn:legacy_restart"
-    else
-      invoke "unicorn:start"
-      invoke "web:enable"
-    end
-  end
-end
-
-namespace :deploy do
-  desc "Deploy a rolling update without taking the site down for maintenance"
-  task :rolling do
-    set :rolling_deploy, true
-    invoke "deploy"
-  end
-end
-
-before "deploy:migrate", "app:disable"
-after "deploy:published", "app:enable"
-
-before "app:disable", "delayed_job:stop"
-after "app:enable", "delayed_job:start"
diff --git a/lib/capistrano/tasks/delayed_job.rake b/lib/capistrano/tasks/delayed_job.rake
deleted file mode 100644
index a49c18a6b..000000000
--- a/lib/capistrano/tasks/delayed_job.rake
+++ /dev/null
@@ -1,39 +0,0 @@
-namespace :delayed_job do
-  desc "Start delayed_job process"
-  task :start do
-    on roles(:worker) do
-      within current_path do
-        with rails_env: fetch(:rails_env) do
-          bundle = SSHKit.config.command_map[:bundle]
-
-          execute :"systemd-run", "--user --collect --slice delayed_job --unit delayed_job.bulk_update -E RAILS_ENV=$RAILS_ENV -p WorkingDirectory=$PWD -p Restart=always #{bundle} exec bin/delayed_job --queues=bulk_update run"
-          fetch(:delayed_job_workers, 16).times do |n|
-            execute :"systemd-run", "--user --collect --slice delayed_job --unit delayed_job.#{n} -E RAILS_ENV=$RAILS_ENV -p WorkingDirectory=$PWD -p Restart=always #{bundle} exec bin/delayed_job --queues=default run"
-          end
-        end
-      end
-    end
-  end
-
-  desc "Stop delayed_job process"
-  task :stop do
-    on roles(:worker) do
-      execute :systemctl, "--user stop delayed_job.slice"
-    end
-  end
-
-  desc "Restart delayed_job process"
-  task :restart do
-    on roles(:worker) do
-      execute :systemctl, "--user restart delayed_job.slice"
-    end
-  end
-
-  desc "Show status of delayed_job process"
-  task :status do
-    on roles(:worker) do
-      # systemctl exits with status 3 if the service isn't running.
-      execute :systemctl, "--user status delayed_job.slice", raise_on_non_zero_exit: false
-    end
-  end
-end
diff --git a/lib/capistrano/tasks/nginx.rake b/lib/capistrano/tasks/nginx.rake
deleted file mode 100644
index e42dc1467..000000000
--- a/lib/capistrano/tasks/nginx.rake
+++ /dev/null
@@ -1,28 +0,0 @@
-namespace :nginx do
-  desc "Shut down Nginx"
-  task :stop do
-    on roles(:web) do
-      as :user => "root" do
-        execute "/etc/init.d/nginx", "stop"
-      end
-    end
-  end
-
-  desc "Start Nginx"
-  task :start do
-    on roles(:web) do
-      as :user => "root" do
-        execute "/etc/init.d/nginx", "start"
-      end
-    end
-  end
-
-  desc "Reload Nginx"
-  task :reload do
-    on roles(:web) do
-      as :user => "root" do
-        execute "/etc/init.d/nginx", "reload"
-      end
-    end
-  end
-end
diff --git a/lib/capistrano/tasks/symlink.rake b/lib/capistrano/tasks/symlink.rake
deleted file mode 100644
index 24a96712c..000000000
--- a/lib/capistrano/tasks/symlink.rake
+++ /dev/null
@@ -1,19 +0,0 @@
-namespace :symlink do
-  desc "Link the local config files"
-  task :local_files do
-    on roles(:app, :worker) do
-      execute :ln, "-s", "#{deploy_to}/shared/config/danbooru_local_config.rb", "#{release_path}/config/danbooru_local_config.rb"
-    end
-  end
-
-  desc "Link the local directories"
-  task :directories do
-    on roles(:app, :worker) do
-      execute :rm, "-f", "#{release_path}/public/data"
-      execute :ln, "-s", "#{deploy_to}/shared/data", "#{release_path}/public/data"
-    end
-  end
-end
-
-after "deploy:symlink:shared", "symlink:local_files"
-after "deploy:symlink:shared", "symlink:directories"
diff --git a/lib/capistrano/tasks/web.rake b/lib/capistrano/tasks/web.rake
deleted file mode 100644
index 7a4e024ad..000000000
--- a/lib/capistrano/tasks/web.rake
+++ /dev/null
@@ -1,21 +0,0 @@
-namespace :web do
-  desc "Present a maintenance page to visitors."
-  task :disable do
-    on roles(:app) do
-      maintenance_html_path = "#{current_path}/public/maintenance.html.bak"
-      if test("[ -e #{maintenance_html_path} ]")
-        execute :mv, maintenance_html_path, "#{current_path}/public/maintenance.html"
-      end
-    end
-  end
-
-  desc "Makes the application web-accessible again."
-  task :enable do
-    on roles(:app) do
-      maintenance_html_path = "#{current_path}/public/maintenance.html"
-      if test("[ -e #{maintenance_html_path} ]")
-        execute :mv, maintenance_html_path, "#{current_path}/public/maintenance.html.bak"
-      end
-    end
-  end
-end