diff --git a/Gemfile b/Gemfile
index 987c75ec5..4127ede86 100644
--- a/Gemfile
+++ b/Gemfile
@@ -42,6 +42,7 @@ gem 'unicode_utils'
 
 # Gestion des comptes utilisateurs
 gem 'devise'
+gem 'devise-async'
 gem 'openid_connect'
 gem 'omniauth-github'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index e7116b9f6..110b9c397 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -175,6 +175,9 @@ GEM
       railties (>= 4.1.0, < 6.0)
       responders
       warden (~> 1.2.3)
+    devise-async (1.0.0)
+      activejob (>= 5.0)
+      devise (>= 4.0)
     diff-lcs (1.3)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
@@ -803,6 +806,7 @@ DEPENDENCIES
   delayed_job_active_record
   delayed_job_web!
   devise
+  devise-async
   dotenv-rails
   draper
   factory_bot
diff --git a/app/models/administrateur.rb b/app/models/administrateur.rb
index 164ff18be..e4fd48ca8 100644
--- a/app/models/administrateur.rb
+++ b/app/models/administrateur.rb
@@ -2,7 +2,7 @@ class Administrateur < ApplicationRecord
   include CredentialsSyncableConcern
   include EmailSanitizableConcern
 
-  devise :database_authenticatable, :registerable,
+  devise :database_authenticatable, :registerable, :async,
     :recoverable, :rememberable, :trackable, :validatable
 
   has_and_belongs_to_many :gestionnaires
diff --git a/app/models/administration.rb b/app/models/administration.rb
index bfc452d63..2428749f3 100644
--- a/app/models/administration.rb
+++ b/app/models/administration.rb
@@ -1,7 +1,7 @@
 class Administration < ApplicationRecord
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
-  devise :database_authenticatable, :rememberable, :trackable, :validatable, :omniauthable, omniauth_providers: [:github]
+  devise :database_authenticatable, :rememberable, :trackable, :validatable, :omniauthable, :async, omniauth_providers: [:github]
 
   def self.from_omniauth(params)
     find_by(email: params["info"]["email"])
diff --git a/app/models/gestionnaire.rb b/app/models/gestionnaire.rb
index 253fc1523..76b737e9a 100644
--- a/app/models/gestionnaire.rb
+++ b/app/models/gestionnaire.rb
@@ -2,7 +2,7 @@ class Gestionnaire < ApplicationRecord
   include CredentialsSyncableConcern
   include EmailSanitizableConcern
 
-  devise :database_authenticatable, :registerable,
+  devise :database_authenticatable, :registerable, :async,
     :recoverable, :rememberable, :trackable, :validatable
 
   has_and_belongs_to_many :administrateurs
diff --git a/app/models/user.rb b/app/models/user.rb
index 1bd1668a7..2de403c64 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -9,7 +9,7 @@ class User < ApplicationRecord
 
   # Include default devise modules. Others available are:
   # :confirmable, :lockable, :timeoutable and :omniauthable
-  devise :database_authenticatable, :registerable,
+  devise :database_authenticatable, :registerable, :async,
     :recoverable, :rememberable, :trackable, :validatable, :confirmable
 
   has_many :dossiers, dependent: :destroy
diff --git a/spec/controllers/users/registrations_controller_spec.rb b/spec/controllers/users/registrations_controller_spec.rb
index 36d26d9de..8fe725f9f 100644
--- a/spec/controllers/users/registrations_controller_spec.rb
+++ b/spec/controllers/users/registrations_controller_spec.rb
@@ -15,8 +15,9 @@ describe Users::RegistrationsController, type: :controller do
 
     context 'when user is correct' do
       it 'sends confirmation instruction' do
-        expect(DeviseUserMailer).to receive(:confirmation_instructions).and_return(DeviseUserMailer)
-        expect(DeviseUserMailer).to receive(:deliver)
+        message = double()
+        expect(DeviseUserMailer).to receive(:confirmation_instructions).and_return(message)
+        expect(message).to receive(:deliver_later)
 
         subject
       end