diff --git a/scripts/install b/scripts/install
index 4e0c649..6d89f34 100644
--- a/scripts/install
+++ b/scripts/install
@@ -80,6 +80,7 @@ ynh_script_progression --message="Installing dependencies..." --weight=20
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 ynh_exec_warn_less ynh_install_mongo
+ynh_exec_warn_less 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
@@ -147,7 +148,7 @@ ynh_script_progression --message="Building $app... (this will take some time and
 
 pushd $final_path/programs/server
 	ynh_use_nodejs
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH $ynh_npm install --unsafe-perm
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install --unsafe-perm
 popd
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index dceea60..94cb8cd 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -73,6 +73,7 @@ ynh_script_progression --message="Reinstalling dependencies..." --weight=1
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 ynh_exec_warn_less ynh_install_mongo
+ynh_exec_warn_less 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
diff --git a/scripts/upgrade b/scripts/upgrade
index 9025833..1c4b7f7 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -108,6 +108,7 @@ ynh_script_progression --message="Upgrading dependencies..." --weight=7
 ynh_exec_warn_less ynh_install_app_dependencies $pkg_dependencies
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 ynh_exec_warn_less ynh_install_mongo
+ynh_exec_warn_less 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
@@ -141,7 +142,7 @@ ynh_script_progression --message="Building $app... (this will take some time and
 
 pushd $final_path/programs/server
 	ynh_use_nodejs
-	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH npm install --unsafe-perm
+	ynh_exec_warn_less ynh_exec_as $app env $ynh_node_load_PATH yarn install --unsafe-perm
 popd
 
 #=================================================