diff --git a/scripts/_common.sh b/scripts/_common.sh
index a9bf588..2541082 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1 +1,15 @@
 #!/bin/bash
+
+# Execute a command as another user
+# usage: exec_as USER COMMAND [ARG ...]
+exec_as() {
+	local USER=$1
+	shift 1
+
+	if [[ $USER = $(whoami) ]]
+	then
+		eval $@
+	else
+		sudo -u "$USER" $@
+	fi
+}
diff --git a/scripts/upgrade b/scripts/upgrade
index c054c34..1b120d2 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -103,6 +103,16 @@ ynh_system_user_create "$app"
 # Create a dedicated php-fpm config
 ynh_add_fpm_config
 
+#=================================================
+# SPECIFIC UPGRADE
+#=================================================
+# UPDATE PLUGINS
+#=================================================
+
+pushd "$final_path"
+	exec_as "$app" "bin/gpm update -y"
+popd
+
 #=================================================
 # GENERIC FINALIZATION
 #=================================================