diff --git a/scripts/install b/scripts/install
index 01fa605..33c4fff 100644
--- a/scripts/install
+++ b/scripts/install
@@ -98,9 +98,12 @@ ynh_app_setting_set $app port $port
 ###		- As well as the section "REINSTALL DEPENDENCIES" in the restore script
 ###		- And the section "UPGRADE DEPENDENCIES" in the upgrade script
 
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
 
 #=================================================
 # CREATE A POSTGRESQL DATABASE
@@ -190,12 +193,6 @@ chown -R "$app":"$app" "$final_path"
 
 pushd $final_path
     ynh_use_nodejs
-	#sudo -u $app env PATH=$PATH:$nodejs_path npm install "acorn@^6.0.0" --save
-	#sudo -u $app env PATH=$PATH:$nodejs_path npm install "babel-core@>=6.0.20" --save
-	#sudo -u $app env PATH=$PATH:$nodejs_path npm install "graphql@^0.13.0" --save
-	#sudo -u $app env PATH=$PATH:$nodejs_path npm install "eslint@>=5.0.0" --save
-    #sudo -u $app env PATH=$PATH:$nodejs_path npm install
-	#sudo -u $app env PATH=$PATH:$nodejs_path npm audit fix
 	sudo -u $app env PATH=$PATH:$nodejs_path yarn install
     sudo -u $app env PATH=$PATH:$nodejs_path npm run build
 popd
diff --git a/scripts/remove b/scripts/remove
index 9f2ab84..2b6f6a4 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -58,6 +58,8 @@ ynh_remove_app_dependencies
 ynh_use_nodejs
 ynh_remove_nodejs
 
+rm -rf "/etc/apt/sources.list.d/yarn.list"
+
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 0d0c4d8..35a175a 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -93,9 +93,12 @@ chown -R "$app":"$app" "$final_path"
 
 # Define and install dependencies
 
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
 
 #=================================================
 # RESTORE SYSTEMD
diff --git a/scripts/upgrade b/scripts/upgrade
index 08b616f..2080e5a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -102,9 +102,12 @@ ynh_add_nginx_config
 # UPGRADE DEPENDENCIES
 #=================================================
 
+curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+
 ynh_install_nodejs 10
 
-ynh_install_app_dependencies redis-server postgresql postgresql-contrib
+ynh_install_app_dependencies redis-server postgresql postgresql-contrib yarn
 
 #=================================================
 # CREATE DEDICATED USER