.. _version_4.5.3:

=============
Version 4.5.3
=============

Released on 2021-06-22.

.. NOTE::

    If upgrading a cluster, you must be running CrateDB 4.0.2 or higher before
    you upgrade to 4.5.3.

    We recommend that you upgrade to the latest 4.4 release before moving to
    4.5.3.

    A rolling upgrade from 4.4.0+ to 4.5.3 is supported.

    Before upgrading, you should `back up your data`_.

.. _back up your data: https://crate.io/docs/crate/reference/en/latest/admin/snapshots.html



.. rubric:: Table of Contents

.. contents::
   :local:

See the :ref:`version_4.5.0` release notes for a full list of changes in the
4.5 series.

Fixes
=====

- Fixed a regression introduced in 4.5.2 which caused aggregations on virtual
  tables using a primary key lookup to fail. An example::

    SELECT count(*) FROM (
      SELECT * FROM users WHERE id = ? AND (addr is NULL)
    ) AS u;
