I am getting this error every time I run composer update in my Yii2 framework project

enter image description hereProblem 1
– phpunit/phpunit[9.5.0, …, 9.5.28] require ext-dom * -> it is missing from your system. Install or enable PHP’s dom extension.
– Root composer.json requires phpunit/phpunit ~9.5.0 -> satisfiable by phpunit/phpunit[9.5.0, …, 9.5.28].
text

I have tried running run Composer with --ignore-platform-req=ext-dom but returns the same error.