diff --git a/scripts/install b/scripts/install
index c44bae8..9fc1369 100755
--- a/scripts/install
+++ b/scripts/install
@@ -72,6 +72,9 @@ ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$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"
+
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
@@ -128,9 +131,9 @@ ynh_add_config --template="../conf/.env" --destination="$final_path/.env"
 ynh_script_progression --message="Configuring the app..." --weight=15
 
 pushd $final_path
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm install
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm run build
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm update-db
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn build
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn update-db
 popd
 
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 45ad72a..62a67ac 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -99,8 +99,9 @@ ynh_add_nginx_config
 ynh_script_progression --message="Configuring the app..." --weight=15
 
 pushd $final_path
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm install
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm run build
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn build
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn update-db
 popd
 
 #=================================================