diff --git a/scripts/upgrade b/scripts/upgrade
index e6f6137d..e2a8f498 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -113,6 +113,17 @@ ynh_print_info --message="Upgrading nginx web server configuration..."
 # Create a dedicated nginx config
 ynh_add_nginx_config
 
+#=================================================
+# UPGRADE PHP7.3
+#=================================================
+
+if [ "$(lsb_release --codename --short)" = "buster" ]; then
+	pkg_dependencies="$pkg_dependencies $extra_pkg_dependencies"
+else
+	ynh_print_info --message="Upgrading php7.3..."
+	ynh_install_php --phpversion="7.3" --package="$extra_pkg_dependencies"
+fi
+
 #=================================================
 # UPGRADE DEPENDENCIES
 #=================================================
@@ -120,14 +131,6 @@ ynh_print_info --message="Upgrading dependencies..."
 
 ynh_install_app_dependencies "$pkg_dependencies"
 
-#=================================================
-# UPGRADE PHP
-#=================================================
-ynh_print_info --message="Upgrading php..."
-
-ynh_remove_php
-ynh_install_php --phpversion="7.3" --package="$extra_pkg_dependencies"
-
 #=================================================
 # CREATE DEDICATED USER
 #=================================================