My b2evolution Version: 2.x

When i update Installer for version 3.3.1.

Loading: _core/model/__core.install.php
Loading: sessions/model/_sessions.install.php
Checking DB schema version... 9700 : OK.
Upgrading blogs table... OK.
Upgrading items table... OK.
Creating keyphrase table... OK.
Upgrading hitlog table... OK.
Upgrading sessions table... OK.
Creating goal tracking table... OK.
Creating DB schema version checkpoint at 9800... OK. (Elapsed upgrade time: 17 seconds)
Updating keyphrases in hitlog table...
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 47 bytes) in
C:\xampp\htdocs\b2evolution\inc\_core\model\db\_db.class.php on line 812

- I test update on xampp.
- Please, suggestion. Thank you