diff --git a/.github/settings.yml b/.github/settings.yml
index 956f2118..47694459 100644
--- a/.github/settings.yml
+++ b/.github/settings.yml
@@ -50,12 +50,18 @@ branches:
         contexts:
           - "Coding Standards (7.4)"
           - "Static Code Analysis (7.4)"
-          - "Tests (7.2, lowest)"
-          - "Tests (7.2, highest)"
-          - "Tests (7.3, lowest)"
-          - "Tests (7.3, highest)"
-          - "Tests (7.4, lowest)"
-          - "Tests (7.4, highest)"
+          - "Tests (7.2, lowest, ~4.2)"
+          - "Tests (7.2, lowest, ~5.0)"
+          - "Tests (7.2, highest, ~4.2)"
+          - "Tests (7.2, highest, ~5.0)"
+          - "Tests (7.3, lowest, ~4.2)"
+          - "Tests (7.3, lowest, ~5.0)"
+          - "Tests (7.3, highest, ~4.2)"
+          - "Tests (7.3, highest, ~5.0)"
+          - "Tests (7.4, lowest, ~4.2)"
+          - "Tests (7.4, lowest, ~5.0)"
+          - "Tests (7.4, highest, ~4.2)"
+          - "Tests (7.4, highest, ~5.0)"
           - "Code Coverage (7.4)"
         strict: true
 
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index d7b37c54..bda15854 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -114,6 +114,10 @@ jobs:
           - lowest
           - highest
 
+        symfony:
+          - ~4.2
+          - ~5.0
+
     steps:
       - name: "Checkout"
         uses: actions/checkout@v1
@@ -133,6 +137,9 @@ jobs:
           restore-keys: |
             php${{ matrix.php-version }}-composer-${{ matrix.dependencies }}-
 
+      - name: "Lock symfony version"
+        run: composer require "symfony/symfony:${{ matrix.symfony }}" --no-update
+
       - name: "Install lowest dependencies with composer"
         if: matrix.dependencies == 'lowest'
         run: composer update --no-interaction --no-progress --no-suggest --prefer-lowest
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 443c6823..9e1f946e 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -11,14 +11,8 @@ parameters:
     ignoreErrors:
         # Symfony DI
         - '#Cannot call method defaultValue\(\) on Symfony\\Component\\Config\\Definition\\Builder\\NodeParentInterface\|null.#'
-        - "/Call to function method_exists.. with 'Symfony.+' and 'getRootNode' will always evaluate to false./"
 
         # PHPUnit
         -
             message: '#Property .*::\$.* has no typehint specified.#'
             path: tests/
-
-        -
-            message: "#^Call to an undefined method Symfony\\\\Component\\\\Config\\\\Definition\\\\Builder\\\\TreeBuilder::root\\(\\)\\.$#"
-            count: 1
-            path: src/DependencyInjection/Configuration.php
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 8a137089..39c24eea 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -21,12 +21,8 @@ public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder('core23_dompdf');
 
-        // Keep compatibility with symfony/config < 4.2
-        if (!method_exists(TreeBuilder::class, 'getRootNode')) {
-            $rootNode = $treeBuilder->root('core23_dompdf');
-        } else {
-            $rootNode = $treeBuilder->getRootNode();
-        }
+        $rootNode = $treeBuilder->getRootNode();
+
         \assert($rootNode instanceof ArrayNodeDefinition);
 
         $rootNode