diff --git a/conf/.sequelizerc.example b/conf/.sequelizerc.example
index ddb5cba..9b42bbf 100644
--- a/conf/.sequelizerc.example
+++ b/conf/.sequelizerc.example
@@ -1,8 +1,10 @@
-var path = require('path');
+const path = require('path')
+const config = require('./lib/config')
 
 module.exports = {
-    'config':          path.resolve('config.json'),
-    'migrations-path': path.resolve('lib', 'migrations'),
-    'models-path':     path.resolve('lib', 'models'),
-    'url':             'postgres://__DB_NAME__:__DB_PWD__@localhost:5432/__DB_NAME__'
+  config: path.resolve('config.js'),
+  'migrations-path': path.resolve('lib', 'migrations'),
+  'models-path': path.resolve('lib', 'models'),
+  url: 'postgres://__DB_NAME__:__DB_PWD__@localhost:5432/__DB_NAME__'
 }
+
diff --git a/scripts/change_url b/scripts/change_url
index c0b818f..a5b16b6 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -117,12 +117,12 @@ path_url=${path_url:1}
 
 cp ../conf/config.json.example "$final_path/config.json"
 
-ynh_replace_string --match_string="__PORT__"    --replace_string="$port" --target_file="$final_path/config.json"
-ynh_replace_string --match_string="__DOMAIN__"  --replace_string="$domain" --target_file="$final_path/config.json"
-ynh_replace_string --match_string="__PATH__"    --replace_string="${path_url:1}" --target_file="$final_path/config.json"
+ynh_replace_string --match_string="__PORT__" --replace_string="$port" --target_file="$final_path/config.json"
+ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="$final_path/config.json"
+ynh_replace_string --match_string="__PATH__" --replace_string="${path_url:1}" --target_file="$final_path/config.json"
 ynh_replace_string --match_string="__DB_NAME__" --replace_string="$db_name" --target_file="$final_path/config.json"
 ynh_replace_string --match_string="__DB_PWD__" --replace_string="$db_pwd" --target_file="$final_path/config.json"
-ynh_replace_string --match_string="__APP__"     --replace_string="$app" --target_file="$final_path/config.json"
+ynh_replace_string --match_string="__APP__" --replace_string="$app" --target_file="$final_path/config.json"
 
 ynh_store_file_checksum --file="$final_path/config.json"
 
diff --git a/scripts/install b/scripts/install
index 7f75254..e27059c 100644
--- a/scripts/install
+++ b/scripts/install
@@ -69,9 +69,6 @@ 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"
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -115,12 +112,24 @@ ynh_add_nginx_config
 #==============================================
 ynh_script_progression --message="Building CodiMD... (this will take some time and resources!)" --weight=24
 
+chown -R $app: $final_path
+
 pushd "$final_path" || ynh_die
 	ynh_use_nodejs
-	ynh_exec_warn_less bin/setup 
-	ynh_exec_warn_less yarn run build
+	ynh_exec_warn_less bin/setup
+	ynh_exec_as $app env $ynh_node_load_PATH npm update 
+	ynh_exec_as $app env $ynh_node_load_PATH npm run build
 popd || ynh_die
 
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+ynh_script_progression --message="Modifying a config file..."
+
+path=${path_url:1}
+ynh_add_config --template="../conf/config.json.example" --destination="$final_path/config.json"
+ynh_add_config --template="../conf/.sequelizerc.example" --destination="$final_path/.sequelizerc"
+
 #=================================================
 # SETUP SYSTEMD
 #=================================================
@@ -128,19 +137,8 @@ ynh_script_progression --message="Configuring a systemd service..." --weight=1
 
 ynh_replace_string --match_string="__ENV_PATH__" --replace_string="$PATH" --target_file="../conf/systemd.service"
 ynh_replace_string --match_string="__YNH_NPM__" --replace_string="$ynh_npm" --target_file="../conf/systemd.service"
-
 ynh_add_systemd_config
 
-#=================================================
-# MODIFY A CONFIG FILE
-#=================================================
-ynh_script_progression --message="Modifying a config file..."
-
-path=${path_url:1}
-
-ynh_add_config --template="../conf/config.json.example" --destination="$final_path/config.json"
-ynh_add_config --template="../conf/.sequelizerc.example" --destination="$final_path/.sequelizerc"
-
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index c885542..33317e0 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -113,9 +113,6 @@ 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"
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -136,18 +133,10 @@ then
 	pushd "$final_path" || ynh_die
 		ynh_use_nodejs
 		ynh_exec_warn_less bin/setup
-		ynh_exec_warn_less yarn run build
+		ynh_exec_warn_less ynh_npm run build
 	popd || ynh_die
 fi
 
-#=================================================
-# MODIFY A CONFIG FILE
-#=================================================
-#ynh_script_progression --message="Modifying a config file..." --weight=2
-
-#path=${path_url:1}
-#ynh_add_config --template="../conf/config.json.example" --destination="$final_path/config.json"
-
 #=================================================
 # SETUP SYSTEMD
 #=================================================
@@ -155,7 +144,6 @@ ynh_script_progression --message="Configuring a systemd service..." --weight=2
 
 ynh_replace_string --match_string="__ENV_PATH__" --replace_string="$PATH" --target_file="../conf/systemd.service"
 ynh_replace_string --match_string="__YNH_NPM__" --replace_string="$ynh_npm" --target_file="../conf/systemd.service"
-
 # Create a dedicated systemd config
 ynh_add_systemd_config