diff --git a/manifest.json b/manifest.json
index 72f56ee..6d1e6db 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "Zero Knowledge realtime collaborative editor",
         "fr": "Éditeur chiffré collaboratif en temps réel."
     },
-    "version": "4.0.0~ynh1",
+    "version": "4.0.0~ynh2",
     "url": "https://cryptpad.fr/",
     "license": "AGPL-3.0-only",
     "maintainer": {
diff --git a/scripts/change_url b/scripts/change_url
index 7de1f4a..eab8900 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -69,7 +69,7 @@ fi
 #=================================================
 ynh_script_progression --message="Stopping a systemd service..." --weight=1
 
-ynh_systemd_action --service_name=$app --action="stop" --log_path="/var/log/$app/$app.log"
+ynh_systemd_action --service_name=$app --action=stop --log_path="/var/log/$app/$app.log"
 
 #=================================================
 # MODIFY URL IN NGINX CONF
@@ -107,7 +107,7 @@ fi
 #=================================================
 ynh_script_progression --message="Starting a systemd service..." --weight=1
 
-ynh_systemd_action --service_name=$app --action="start" --log_path="systemd" --line_match="server available"
+ynh_systemd_action --service_name=$app --action=start --log_path="systemd" --line_match="server available"
 
 #=================================================
 # RELOAD NGINX
diff --git a/scripts/install b/scripts/install
index 1dc57bb..94bef7b 100644
--- a/scripts/install
+++ b/scripts/install
@@ -75,9 +75,6 @@ ynh_script_progression --message="Installing dependencies..." --weight=20
 # 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"
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -136,9 +133,9 @@ ynh_script_progression --message="Building CryptPad... (this will take some time
 
 pushd "$final_path" || ynh_die
 	ynh_use_nodejs
-	ynh_exec_warn_less yarn install --allow-root
-	yarn global add bower
-	bower install --allow-root
+	ynh_exec_warn_less npm install --allow-root
+	ynh_exec_warn_less npm install -g bower
+	ynh_exec_warn_less bower install --allow-root
 popd || ynh_die
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 676dc1f..be98399 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -80,9 +80,6 @@ ynh_script_progression --message="Reinstalling dependencies..." --weight=7
 # 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 SYSTEMD
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index ddcd909..3d417e8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -102,9 +102,6 @@ ynh_script_progression --message="Upgrading dependencies..." --weight=6
 # 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"
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -135,7 +132,7 @@ ynh_store_file_checksum "$final_path/config/config.js"
 ynh_script_progression --message="Building CryptPad... (this will take some time and resources!)" --weight=60
 
 pushd "$final_path" || ynh_die
-	bower update --allow-root
+	ynh_exec_warn_less bower update --allow-root
 popd || ynh_die
 
 #=================================================