diff --git a/scripts/install b/scripts/install
index ffda580..c37f768 100644
--- a/scripts/install
+++ b/scripts/install
@@ -94,7 +94,7 @@ ynh_app_setting_set $app port $port
 #=================================================
 ynh_print_info "Installing yarn 1.13.0..."
 
-sudo apt install ../sources/yarn_1.13.0_all.deb
+sudo apt install -y ../sources/yarn_1.13.0_all.deb
 
 #=================================================
 # INSTALL DEPENDENCIES
diff --git a/scripts/upgrade b/scripts/upgrade
index 31f6747..b6edd2a 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -107,7 +107,7 @@ ynh_add_nginx_config
 #=================================================
 ynh_print_info "Installing yarn 1.13.0..."
 
-sudo apt install ../sources/yarn_1.13.0_all.deb
+sudo apt install -y ../sources/yarn_1.13.0_all.deb
 
 #=================================================
 # UPGRADE DEPENDENCIES