Compatibility Note

Infection requires a recent version of PHP, and Xdebug, phpdbg, or pcov enabled.

You can still use an older Infection version if you’re using an older PHP version.

PHP version Infection version
8.0.0 >= 0.26.7
7.4.0 >= 0.18, <= 0.26.6
7.3.12 0.16-0.17
7.2.9+ 0.14-0.15
7.1 0.10 - 0.13
7.0 < 0.10


Phar distribution is the best and recommended way of installing Infection on your computer. Unlike infection/infection, it is bundled with all officially supported Test Frameworks: PHPUnit, PhpSpec, Pest and Codeception.

Download the latest infection.phar and infection.phar.asc:


chmod +x infection.phar

The PHAR is signed with our GPG key. In order to verify whether the PHAR file was signed by Infection team, execute the following:

gpg --recv-keys C6D76C329EBADE2FB9C458CFC5095986493B4AA0
gpg --with-fingerprint --verify infection.phar.asc infection.phar

You should see something like:

gpg: Signature made Sun Aug  5 21:46:42 2018 +03
gpg: using RSA key XYZ
gpg: Good signature from "Infection PHP <>" [ultimate]
Primary key fingerprint: C6D7 6C32 9EBA DE2F B9C4 58CF C509 5986 493B 4AA0

Make sure fingerprint is equal to C6D7 6C32 9EBA DE2F B9C4 58CF C509 5986 493B 4AA0.

Additionally, it can be copied to /usr/local/bin to make it available globally in the terminal:

mv infection.phar /usr/local/bin/infection

# and then run just like



Infection can also be installed by Phive - The PHAR Installation and Verification Environment.

phive install infection


You can install it globally as any other general purpose tool:

composer global require infection/infection

Do not forget to include it to ~/.bash_profile (or ~/.bashrc)!

export PATH=~/.config/composer/vendor/bin:$PATH

After that, you will be able to run Infection from project root:

# cd /path/to/project/root

infection --threads=4


This installation type is suitable for Infection development purposes or as a quickest (but not the best) way to try it locally for your project.

git clone
cd infection
composer install

Runnable infection command will be available at bin/infection. Assuming that you have installed Infection to ~/infection, you can run mutation testing for you project in such way:

# cd /path/to/project/root



Infection can be installed through Homebrew

brew tap infection/homebrew-infection
brew install infection

Homebrew automatically links the executable in the /usr/local/bin directory so that it is available globally.
You can then run Infection from project root:


Tap repository: