First, open the ``composer.json`` file located in the root directory of your

project. Then, edit the value of the version defined for the ``symfony/symfony``

dependency:

dependency as follows:

..code-block::json

Then, before updating your dependencies, make sure that the project configuration

allows to install unstable versions. If the ``composer.json`` file contains a

``minimum-stability`` option, change its value to ``dev``. If that option doesn't

exist, add it as follows:

..code-block::json

If you prefer to test a Symfony beta version, replace the ``dev`` value of the

``minimum-stability`` option by ``beta``.

Then, open a command console, enter your project directory and execute the following command to update your project dependencies:

Then, open a command console, enter your project directory and execute the following

command to update your project dependencies:

..code-block::bash

If you prefer to test a Symfony beta version, replace the ``"2.7.*@dev"`` constraint

by ``"2.7.*@beta1"`` (or any other beta number).

..tip::

If you use Git to manage the project's code, it's a good practice to create