diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1a14fd998..8727017a1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -92,24 +92,6 @@ jobs:
       - run:
           name: Run linters
           command: bundle exec rake lint
-  deploy:
-    <<: *defaults
-    steps:
-      - checkout
-      - *bundle_restore_cache
-      - *bundle_install
-      - add_ssh_keys:
-          fingerprints:
-            - "0e:db:db:9c:54:ac:60:1a:d3:ba:28:03:2e:7d:0e:9a"
-      - deploy:
-          command: |
-            if [ "${CIRCLE_BRANCH}" == "dev" ]; then
-              bundle exec rake deploy to=staging
-            fi
-
-            if [ "${CIRCLE_BRANCH}" == "master" ]; then
-              bundle exec rake deploy to=production
-            fi
 
 workflows:
   version: 2
@@ -122,12 +104,3 @@ workflows:
       - lint:
           requires:
             - build
-      - deploy:
-          filters:
-            branches:
-              only:
-                - dev
-                - master
-          requires:
-            - test
-            - lint
diff --git a/Gemfile b/Gemfile
index 35c8dd8d8..8b19a11d5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,8 +17,8 @@ gem 'deep_cloneable'
 
 gem 'warden', git: 'https://github.com/hassox/warden.git', branch: 'master'
 
-# Use Unicorn as the app server
-gem 'unicorn'
+# Use Puma as the app server
+gem 'puma'
 
 # serializer
 gem 'active_model_serializers'
@@ -171,7 +171,7 @@ group :development, :test do
   gem 'rspec-rails'
 
   # Deploy
-  gem 'mina', ref: '343a7', git: 'https://github.com/mina-deploy/mina.git'
+  gem 'mina', git: 'https://github.com/mina-deploy/mina.git'
 
   gem 'rspec_junit_formatter'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index a69a5d7c1..68e1b2e9b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,10 +8,9 @@ GIT
 
 GIT
   remote: https://github.com/mina-deploy/mina.git
-  revision: 343a7ab672d8b4f0ddb84ec240cde7d94b46397a
-  ref: 343a7
+  revision: 0dd5fdb8bb82a180d35e1fc033de2fac48257e30
   specs:
-    mina (0.3.8)
+    mina (1.2.3)
       open4 (~> 1.3.4)
       rake
 
@@ -450,7 +449,6 @@ GEM
       activerecord
       kaminari-core (= 1.1.1)
     kaminari-core (1.1.1)
-    kgio (2.11.2)
     launchy (2.4.3)
       addressable (~> 2.3)
     letter_opener (1.6.0)
@@ -558,6 +556,7 @@ GEM
       byebug (~> 10.0)
       pry (~> 0.10)
     public_suffix (3.0.2)
+    puma (3.12.0)
     rack (2.0.5)
     rack-handlers (0.7.3)
       rack
@@ -607,7 +606,6 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
-    raindrops (0.19.0)
     rake (12.3.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
@@ -764,9 +762,6 @@ GEM
       unf_ext
     unf_ext (0.0.7.5)
     unicode-display_width (1.4.0)
-    unicorn (5.4.1)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     validate_email (0.1.6)
       activemodel (>= 3.0)
       mail (>= 2.2.5)
@@ -863,6 +858,7 @@ DEPENDENCIES
   prawn_rails
   premailer-rails
   pry-byebug
+  puma
   rack-handlers
   rack-mini-profiler
   rails
@@ -891,7 +887,6 @@ DEPENDENCIES
   timecop
   turbolinks
   typhoeus
-  unicorn
   vcr
   warden!
   web-console
diff --git a/app/controllers/champs/dossier_link_controller.rb b/app/controllers/champs/dossier_link_controller.rb
index d4297c733..1ba3823e1 100644
--- a/app/controllers/champs/dossier_link_controller.rb
+++ b/app/controllers/champs/dossier_link_controller.rb
@@ -2,6 +2,8 @@ class Champs::DossierLinkController < ApplicationController
   before_action :authenticate_logged_user!
 
   def show
+    @position = params[:position]
+
     if params[:dossier].key?(:champs_attributes)
       @dossier_id = params[:dossier][:champs_attributes][params[:position]][:value]
     else
diff --git a/app/views/champs/dossier_link/show.js.erb b/app/views/champs/dossier_link/show.js.erb
index d561ee26a..dece3758a 100644
--- a/app/views/champs/dossier_link/show.js.erb
+++ b/app/views/champs/dossier_link/show.js.erb
@@ -1,3 +1,3 @@
-<%= render_to_element('.dossier-link .help-block',
+<%= render_to_element(".dossier-link-#{@position} .help-block",
   partial: 'shared/champs/dossier_link/help_block',
   locals: { id: @dossier_id }) %>
diff --git a/app/views/shared/dossiers/editable_champs/_dossier_link.html.haml b/app/views/shared/dossiers/editable_champs/_dossier_link.html.haml
index 40d830ad8..37e67954c 100644
--- a/app/views/shared/dossiers/editable_champs/_dossier_link.html.haml
+++ b/app/views/shared/dossiers/editable_champs/_dossier_link.html.haml
@@ -1,4 +1,4 @@
-.dossier-link
+.dossier-link{ class: "dossier-link-#{form.index}" }
   = form.number_field :value,
     placeholder: "Numéro de dossier",
     autocomplete: 'off',
diff --git a/config/deploy.rb b/config/deploy.rb
index ac764f6e5..8e1dcedbe 100644
--- a/config/deploy.rb
+++ b/config/deploy.rb
@@ -13,91 +13,47 @@ require 'mina/rbenv'
 #   forward_agent - SSH forward_agent
 #   user          - Username in the server to SSH to
 
-if !["staging", "production"].include?(ENV['to'])
-  raise "missing or incorrect `to` (should be 'staging' or 'production')"
-end
-
-if ENV['domain'].nil?
-  raise "missing `domain`"
-end
-
-set :domain, ENV['domain']
+set :domain, ENV.fetch('domain')
 set :repository, 'https://github.com/betagouv/tps.git'
-set :port, 2200
-set :rails_env, 'production'
-set :rbenv_path, "/usr/local/rbenv/bin/rbenv"
-set :forward_agent, true
+deploy_to = '/var/www/ds'
+set :deploy_to, deploy_to
+set :user, 'ds'
+set :branch, ENV.fetch('branch')
 
 # Manually create these paths in shared/ (eg: shared/config/database.yml) in your server.
 # They will be linked in the 'deploy:link_shared_paths' step.
-set :shared_paths, [
-  '.env',
+set :shared_dirs, [
   'log',
-  'uploads',
+  'sockets',
   'tmp/pids',
-  'tmp/cache',
-  'tmp/sockets',
-  'public/system',
-  'public/uploads',
-  'config/unicorn.rb'
+  'tmp/cache'
 ]
 
-case ENV["to"]
-when "staging"
-  set :branch, ENV['branch'] || 'dev'
-  set :deploy_to, '/var/www/tps_dev'
-  set :user, 'tps_dev'
-  appname = 'tps_dev'
-when "production"
-  set :branch, ENV['branch'] || 'master'
-  set :deploy_to, '/var/www/tps'
-  set :user, 'tps'
-  appname = 'tps'
-end
+set :rbenv_path, "/home/ds/.rbenv/bin/rbenv"
+set :forward_agent, true # SSH forward_agent.
 
-print "Deploy to #{ENV['to']} environment branch #{branch}\n"
+puts "Deploy to #{ENV.fetch('domain')}, branch: #{ENV.fetch('branch')}"
 
 # This task is the environment that is loaded for most commands, such as
 # `mina deploy` or `mina rake`.
-task :setup => :environment do
-  queue! %[mkdir -p "#{deploy_to}/shared/log"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/log"]
+task :setup do
+  command %[mkdir -p "#{deploy_to}/shared/log"]
+  command %[chmod g+rx,u+rwx "#{deploy_to}/shared/log"]
 
-  queue! %[mkdir -p "#{deploy_to}/shared/bin"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/bin"]
+  command %[mkdir -p "#{deploy_to}/shared/tmp/pids"]
+  command %[chmod g+rx,u+rwx "#{deploy_to}/shared/tmp/pids"]
 
-  queue! %[mkdir -p "#{deploy_to}/shared/tmp/pids"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/tmp/pids"]
+  command %[mkdir -p "#{deploy_to}/shared/tmp/cache"]
+  command %[chmod g+rx,u+rwx "#{deploy_to}/shared/tmp/cache"]
 
-  queue! %[mkdir -p "#{deploy_to}/shared/tmp/cache"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/tmp/cache"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/tmp/sockets"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/tmp/sockets"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/public/system"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/public/system"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/public/uploads"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/public/uploads"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/config"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/config"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/app"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/app"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/views/layouts"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/views/layouts"]
-
-  queue! %[mkdir -p "#{deploy_to}/shared/config/locales/dynamics"]
-  queue! %[chmod g+rx,u+rwx "#{deploy_to}/shared/config/locales/dynamics"]
+  command %[mkdir -p "#{deploy_to}/shared/sockets"]
+  command %[chmod g+rx,u+rwx "#{deploy_to}/shared/sockets"]
 end
 
 namespace :yarn do
   desc "Install package dependencies using yarn."
   task :install do
-    queue %{
+    command %{
       echo "-----> Installing package dependencies using yarn"
       #{echo_cmd %[yarn install --non-interactive]}
     }
@@ -107,34 +63,52 @@ end
 namespace :after_party do
   desc "Run after_party tasks."
   task :run do
-    queue %{
+    command %{
       echo "-----> Running deploy tasks"
-      #{echo_cmd %[#{rake} after_party:run]}
+      #{echo_cmd %[bundle exec rake after_party:run]}
+    }
+  end
+end
+
+namespace :service do
+  desc "Restart puma"
+  task :restart_puma do
+    command %{
+      echo "-----> Restarting puma service"
+      #{echo_cmd %[sudo systemctl restart puma]}
+      echo "-----> Reloading nginx service"
+      #{echo_cmd %[sudo systemctl reload nginx]}
+    }
+  end
+
+  desc "Restart delayed_job"
+  task :restart_delayed_job do
+    command %{
+      echo "-----> Restarting delayed_job service"
+      #{echo_cmd %[sudo systemctl restart delayed_job]}
     }
   end
 end
 
 desc "Deploys the current version to the server."
-task :deploy => :environment do
-  queue 'export PATH=$PATH:/usr/local/rbenv/bin:/usr/local/rbenv/shims'
+task :deploy do
+  command 'export PATH=$PATH:/home/ds/.rbenv/bin:/home/ds/.rbenv/shims'
+  command 'source /home/ds/.profile'
   deploy do
-    queue %[sudo service delayed_job_#{user!} stop || true]
     # Put things that will set up an empty directory into a fully set-up
     # instance of your project.
     invoke :'git:clone'
+
     invoke :'deploy:link_shared_paths'
     invoke :'bundle:install'
     invoke :'yarn:install'
     invoke :'rails:db_migrate'
     invoke :'after_party:run'
-    invoke :'rails:assets_precompile:force'
+    invoke :'rails:assets_precompile'
 
-    to :launch do
-      queue "/etc/init.d/#{user} upgrade "
-      queue! %[sudo service delayed_job_#{user!} start]
-
-      # If you are deploying a review app on a fresh testing environment,
-      # now can be a good time to seed the database.
+    on :launch do
+      invoke :'service:restart_puma'
+      invoke :'service:restart_delayed_job'
     end
   end
 end
diff --git a/config/puma.rb b/config/puma.rb
new file mode 100644
index 000000000..1e19380dc
--- /dev/null
+++ b/config/puma.rb
@@ -0,0 +1,56 @@
+# Puma can serve each request in a thread from an internal thread pool.
+# The `threads` method setting takes two numbers: a minimum and maximum.
+# Any libraries that use thread pools should be configured to match
+# the maximum value specified for Puma. Default is set to 5 threads for minimum
+# and maximum; this matches the default thread size of Active Record.
+#
+threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
+threads threads_count, threads_count
+
+# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
+#
+port        ENV.fetch("PORT") { 3000 }
+
+# Specifies the `environment` that Puma will run in.
+#
+environment ENV.fetch("RAILS_ENV") { "development" }
+
+# Specifies the number of `workers` to boot in clustered mode.
+# Workers are forked webserver processes. If using threads and workers together
+# the concurrency of the application would be max `threads` * `workers`.
+# Workers do not work on JRuby or Windows (both of which do not support
+# processes).
+#
+# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
+
+# Use the `preload_app!` method when specifying a `workers` number.
+# This directive tells Puma to first boot the application and load code
+# before forking the application. This takes advantage of Copy On Write
+# process behavior so workers use less memory. If you use this option
+# you need to make sure to reconnect any threads in the `on_worker_boot`
+# block.
+#
+# preload_app!
+
+# If you are preloading your application and using Active Record, it's
+# recommended that you close any connections to the database before workers
+# are forked to prevent connection leakage.
+#
+# before_fork do
+#   ActiveRecord::Base.connection_pool.disconnect! if defined?(ActiveRecord)
+# end
+
+# The code in the `on_worker_boot` will be called if you are using
+# clustered mode by specifying a number of `workers`. After each worker
+# process is booted, this block will be run. If you are using the `preload_app!`
+# option, you will want to use this block to reconnect to any threads
+# or connections that may have been created at application boot, as Ruby
+# cannot share connections between processes.
+#
+# on_worker_boot do
+#   ActiveRecord::Base.establish_connection if defined?(ActiveRecord)
+# end
+#
+
+# Allow puma to be restarted by `rails restart` command.
+plugin :tmp_restart
diff --git a/config/unicorn.rb b/config/unicorn.rb
deleted file mode 100644
index 1b754e734..000000000
--- a/config/unicorn.rb
+++ /dev/null
@@ -1,105 +0,0 @@
-# Sample verbose configuration file for Unicorn (not Rack)
-#
-# This configuration file documents many features of Unicorn
-# that may not be needed for some applications. See
-# http://unicorn.bogomips.org/examples/unicorn.conf.minimal.rb
-# for a much simpler configuration file.
-#
-# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
-# documentation.
-
-# Use at least one worker per core if you're on a dedicated server,
-# more will usually help for _short_ waits on databases/caches.
-worker_processes 2
-
-# Since Unicorn is never exposed to outside clients, it does not need to
-# run on the standard HTTP port (80), there is no reason to start Unicorn
-# as root unless it's from system init scripts.
-# If running the master process as root and the workers as an unprivileged
-# user, do this to switch euid/egid in the workers (also chowns logs):
-# user "unprivileged_user", "unprivileged_group"
-
-# Help ensure your application will always spawn in the symlinked
-# "current" directory that Capistrano sets up.
-
-# listen on both a Unix domain socket and a TCP port,
-# we use a shorter backlog for quicker failover when busy
-listen "127.0.0.1:3000", :tcp_nopush => true
-
-timeout 60
-
-# By default, the Unicorn logger will write to stderr.
-# Additionally, ome applications/frameworks log to stderr or stdout,
-# so prevent them from going to /dev/null when daemonized here:
-
-# combine Ruby 2.0.0dev or REE with "preload_app true" for memory savings
-# http://rubyenterpriseedition.com/faq.html#adapt_apps_for_cow
-preload_app true
-GC.respond_to?(:copy_on_write_friendly=) and
-  GC.copy_on_write_friendly = true
-
-# Enable this flag to have unicorn test client connections by writing the
-# beginning of the HTTP headers before calling the application.  This
-# prevents calling the application for connections that have disconnected
-# while queued.  This is only guaranteed to detect clients on the same
-# host unicorn runs on, and unlikely to detect disconnects even on a
-# fast LAN.
-check_client_connection false
-
-# local variable to guard against running a hook multiple times
-run_once = true
-
-before_fork do |server, worker|
-  # the following is highly recomended for Rails + "preload_app true"
-  # as there's no need for the master process to hold a connection
-  defined?(ActiveRecord::Base) and
-    ActiveRecord::Base.connection.disconnect!
-
-  # Occasionally, it may be necessary to run non-idempotent code in the
-  # master before forking.  Keep in mind the above disconnect! example
-  # is idempotent and does not need a guard.
-  if run_once
-    # do_something_once_here ...
-    run_once = false # prevent from firing again
-  end
-
-  # The following is only recommended for memory/DB-constrained
-  # installations.  It is not needed if your system can house
-  # twice as many worker_processes as you have configured.
-  #
-  # # This allows a new master process to incrementally
-  # # phase out the old master process with SIGTTOU to avoid a
-  # # thundering herd (especially in the "preload_app false" case)
-  # # when doing a transparent upgrade.  The last worker spawned
-  # # will then kill off the old master process with a SIGQUIT.
-  old_pid = "#{server.config[:pid]}.oldbin"
-  if old_pid != server.pid
-    begin
-      sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
-      Process.kill(sig, File.read(old_pid).to_i)
-    rescue Errno::ENOENT, Errno::ESRCH
-    end
-  end
-  #
-  # Throttle the master from forking too quickly by sleeping.  Due
-  # to the implementation of standard Unix signal handlers, this
-  # helps (but does not completely) prevent identical, repeated signals
-  # from being lost when the receiving process is busy.
-  sleep 1
-end
-
-after_fork do |server, worker|
-  # per-process listener ports for debugging/admin/migrations
-  # addr = "127.0.0.1:#{9293 + worker.nr}"
-  # server.listen(addr, :tries => -1, :delay => 5, :tcp_nopush => true)
-
-  # the following is *required* for Rails + "preload_app true",
-  defined?(ActiveRecord::Base) and
-    ActiveRecord::Base.establish_connection
-
-  # if preload_app is true, then you may also want to check and
-  # restart any other shared sockets/descriptors such as Memcached,
-  # and Redis.  TokyoCabinet file handles are safe to reuse
-  # between any number of forked children (assuming your kernel
-  # correctly implements pread()/pwrite() system calls)
-end
diff --git a/lib/tasks/deploy.rake b/lib/tasks/deploy.rake
index d117fe39f..749c22d74 100644
--- a/lib/tasks/deploy.rake
+++ b/lib/tasks/deploy.rake
@@ -1,6 +1,27 @@
-task :deploy do
-  domains = ['149.202.72.152', '149.202.198.6']
-  domains.each do |domain|
-    sh "mina deploy domain=#{domain}"
+def domains_from_env(env)
+  case env
+  when 'dev'
+    ['web1.dev', 'web2.dev']
+  when 'prod'
+    ['web1', 'web2']
+  else
+    raise "STAGE #{env} is unknown. It must be either dev or prod"
+  end
+end
+
+task :deploy do
+  domains = domains_from_env(ENV.fetch('STAGE'))
+  branch = ENV.fetch('BRANCH')
+
+  domains.each do |domain|
+    sh "mina deploy domain=#{domain} branch=#{branch} force_asset_precompile=true"
+  end
+end
+
+task :setup do
+  domains = domains_from_env(ENV['STAGE'])
+
+  domains.each do |domain|
+    sh "mina setup domain=#{domain} force_asset_precompile=true"
   end
 end
diff --git a/spec/controllers/champs/dossier_link_controller_spec.rb b/spec/controllers/champs/dossier_link_controller_spec.rb
index f2f5be448..f4cda12de 100644
--- a/spec/controllers/champs/dossier_link_controller_spec.rb
+++ b/spec/controllers/champs/dossier_link_controller_spec.rb
@@ -28,10 +28,11 @@ describe Champs::DossierLinkController, type: :controller do
           get :show, params: params, format: 'js'
         }
 
-        it 'returns the procedure name' do
+        it 'renders the procedure name' do
           expect(response.body).to include('Dossier en brouillon')
           expect(response.body).to include(procedure.libelle)
           expect(response.body).to include(procedure.organisation)
+          expect(response.body).to include('.dossier-link-1 .help-block')
         end
       end
 
@@ -41,7 +42,10 @@ describe Champs::DossierLinkController, type: :controller do
           get :show, params: params, format: 'js'
         }
 
-        it { expect(response.body).to include('Ce dossier est inconnu') }
+        it 'renders error message' do
+          expect(response.body).to include('Ce dossier est inconnu')
+          expect(response.body).to include('.dossier-link-1 .help-block')
+        end
       end
     end