diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index d4467a1..ea6f37f 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -18,7 +18,7 @@ jobs:
       uses: shivammathur/setup-php@master
       with:
         php-version: ${{ matrix.php-versions }}
-        extension-csv: mbstring, xdebug
+        extension-csv: mbstring, dom, xdebug
         coverage: xdebug
     - name: Download scrutinizer ocular
       run: wget -q -O ocular.phar https://scrutinizer-ci.com/ocular.phar