diff --git a/db/install.xml b/db/install.xml
index 600cd93..aa806c6 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="admin/tool/groupautoenrol/db" VERSION="20140307" COMMENT="XMLDB file for Moodle admin/tool/groupautoenrol"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
+<XMLDB PATH="admin/tool/groupautoenrol/db" VERSION="20240404" COMMENT="XMLDB file for Moodle admin/tool/groupautoenrol"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:noNamespaceSchemaLocation="../../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
     <TABLE NAME="tool_groupautoenrol" COMMENT="tool_groupautoenrol table.">
@@ -13,9 +13,8 @@
         <FIELD NAME="enrol_method" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="enrolment method"/>
         <FIELD NAME="profile_field" TYPE="int" LENGTH="3" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="profil field"/>
         <FIELD NAME="use_groupslist" TYPE="int" LENGTH="1" NOTNULL="false" DEFAULT="0" SEQUENCE="false" COMMENT="use specific(s) group(s) only"/>
-        <FIELD NAME="groupslist" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Groups to use"/>
+        <FIELD NAME="groupslist" TYPE="text" NOTNULL="false" SEQUENCE="false" COMMENT="Groups to use"/>
         <FIELD NAME="balises" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" COMMENT="Balises for letters"/>
-
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
@@ -23,4 +22,3 @@
     </TABLE>
   </TABLES>
 </XMLDB>
-
diff --git a/db/upgrade.php b/db/upgrade.php
new file mode 100644
index 0000000..d8a5b7d
--- /dev/null
+++ b/db/upgrade.php
@@ -0,0 +1,51 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Upgrade steps.
+ *
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ *
+ * @package   moodle-tool_groupautoenrol
+ * @copyright 04/04/2024 Mfreak.nl | LdesignMedia.nl - Luuk Verhoeven
+ * @author    Luuk Verhoeven
+ **/
+
+/**
+ * xmldb_tool_groupautoenrol_upgrade
+ *
+ * @param $oldversion
+ * @return true
+ */
+function xmldb_tool_groupautoenrol_upgrade($oldversion) {
+
+    global $DB;
+    $dbman = $DB->get_manager();
+
+    if ($oldversion < 2024040400) {
+
+        // Changing type of field groupslist on table tool_groupautoenrol to text.
+        $table = new xmldb_table('tool_groupautoenrol');
+        $field = new xmldb_field('groupslist', XMLDB_TYPE_TEXT, null, null, null, null, null, 'use_groupslist');
+
+        // Launch change of type for field groupslist.
+        $dbman->change_field_type($table, $field);
+
+        // Groupautoenrol savepoint reached.
+        upgrade_plugin_savepoint(true, 2024040400, 'tool', 'groupautoenrol');
+    }
+    return true;
+}