diff --git a/scripts/install b/scripts/install
index 9fc1369..16aea8e 100755
--- a/scripts/install
+++ b/scripts/install
@@ -84,9 +84,9 @@ ynh_script_progression --message="Configuring system user..." --weight=1
 ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
-# CREATE A POSTGRESQL DATABASE
+# CREATE A DATABASE
 #=================================================
-ynh_script_progression --message="Creating a PostgreSQL database..." --weight=2
+ynh_script_progression --message="Creating a database..." --weight=2
 
 db_name=$(ynh_sanitize_dbid --db_name=$app)
 db_user=$db_name
@@ -136,7 +136,6 @@ pushd $final_path
 	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn update-db
 popd
 
-
 #=================================================
 # SETUP SYSTEMD
 #=================================================
diff --git a/scripts/remove b/scripts/remove
index b337ab2..5490de6 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -52,9 +52,9 @@ ynh_script_progression --message="Removing logrotate configuration..." --weight=
 ynh_remove_logrotate
 
 #=================================================
-# REMOVE THE POSTGRESQL DATABASE
+# REMOVE THE DATABASE
 #=================================================
-ynh_script_progression --message="Removing the PostgreSQL database..." --weight=2
+ynh_script_progression --message="Removing the database..." --weight=2
 
 # Remove a database if it exists, along with the associated user
 ynh_psql_remove_db --db_user=$db_user --db_name=$db_name
diff --git a/scripts/restore b/scripts/restore
index b6834eb..ec542e4 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -76,6 +76,9 @@ ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 # Install Nodejs
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 
+# Install Yarn
+ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
+
 #=================================================
 # RESTORE THE NGINX CONFIGURATION
 #=================================================
@@ -84,14 +87,9 @@ ynh_script_progression --message="Restoring the NGINX web server configuration..
 ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
-# RESTORE THE MYSQL DATABASE
+# RESTORE THE DATABASE
 #=================================================
-ynh_script_progression --message="Restoring the MySQL database..." --time --weight=1
-
-#=================================================
-# RESTORE THE POSTGRESQL DATABASE
-#=================================================
-ynh_script_progression --message="Restoring the PostgreSQL database..." --weight=6
+ynh_script_progression --message="Restoring the database..." --weight=6
 
 ynh_psql_test_if_first_run
 ynh_psql_setup_db --db_user=$db_user --db_name=$db_name --db_pwd=$db_pwd
diff --git a/scripts/upgrade b/scripts/upgrade
index 62a67ac..1464a37 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -81,10 +81,14 @@ chown -R $app:www-data "$final_path"
 ynh_script_progression --message="Upgrading dependencies..." --weight=10
 
 ynh_install_app_dependencies $pkg_dependencies
+
 # Install Nodejs
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 ynh_use_nodejs
 
+# Install Yarn
+ynh_install_extra_app_dependencies --repo="deb https://dl.yarnpkg.com/debian/ stable main" --package="yarn" --key="https://dl.yarnpkg.com/debian/pubkey.gpg"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================