diff --git a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
index 2aecdf8259..c964c525e7 100644
--- a/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
+++ b/src/Symfony/Component/Config/Tests/Util/XmlUtilsTest.php
@@ -199,7 +199,9 @@ class XmlUtilsTest extends TestCase
     // test for issue https://github.com/symfony/symfony/issues/9731
     public function testLoadWrongEmptyXMLWithErrorHandler()
     {
-        $originalDisableEntities = libxml_disable_entity_loader(false);
+        if (LIBXML_VERSION < 20900) {
+            $originalDisableEntities = libxml_disable_entity_loader(false);
+        }
         $errorReporting = error_reporting(-1);
 
         set_error_handler(function ($errno, $errstr) {
@@ -219,12 +221,13 @@ class XmlUtilsTest extends TestCase
             error_reporting($errorReporting);
         }
 
-        $disableEntities = libxml_disable_entity_loader(true);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+            libxml_disable_entity_loader($disableEntities);
 
-        libxml_disable_entity_loader($originalDisableEntities);
-
-        $this->assertFalse($disableEntities);
+            libxml_disable_entity_loader($originalDisableEntities);
+            $this->assertFalse($disableEntities);
+        }
 
         // should not throw an exception
         XmlUtils::loadFile(__DIR__.'/../Fixtures/Util/valid.xml', __DIR__.'/../Fixtures/Util/schema.xsd');
diff --git a/src/Symfony/Component/Config/Util/XmlUtils.php b/src/Symfony/Component/Config/Util/XmlUtils.php
index c925f315e5..203741ad11 100644
--- a/src/Symfony/Component/Config/Util/XmlUtils.php
+++ b/src/Symfony/Component/Config/Util/XmlUtils.php
@@ -51,13 +51,17 @@ class XmlUtils
         }
 
         $internalErrors = libxml_use_internal_errors(true);
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
         libxml_clear_errors();
 
         $dom = new \DOMDocument();
         $dom->validateOnParse = true;
         if (!$dom->loadXML($content, LIBXML_NONET | (\defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0))) {
-            libxml_disable_entity_loader($disableEntities);
+            if (LIBXML_VERSION < 20900) {
+                libxml_disable_entity_loader($disableEntities);
+            }
 
             throw new XmlParsingException(implode("\n", static::getXmlErrors($internalErrors)));
         }
@@ -65,7 +69,9 @@ class XmlUtils
         $dom->normalizeDocument();
 
         libxml_use_internal_errors($internalErrors);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         foreach ($dom->childNodes as $child) {
             if (XML_DOCUMENT_TYPE_NODE === $child->nodeType) {
diff --git a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
index cfc13429a1..6754f38767 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php
@@ -620,9 +620,13 @@ $imports
 EOF
         ;
 
-        $disableEntities = libxml_disable_entity_loader(false);
-        $valid = @$dom->schemaValidateSource($source);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(false);
+            $valid = @$dom->schemaValidateSource($source);
+            libxml_disable_entity_loader($disableEntities);
+        } else {
+            $valid = @$dom->schemaValidateSource($source);
+        }
 
         foreach ($tmpfiles as $tmpfile) {
             @unlink($tmpfile);
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
index 5fbb387bf9..4740ae2e19 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Loader/XmlFileLoaderTest.php
@@ -95,13 +95,17 @@ class XmlFileLoaderTest extends TestCase
 
     public function testLoadWithExternalEntitiesDisabled()
     {
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
 
         $containerBuilder = new ContainerBuilder();
         $loader = new XmlFileLoader($containerBuilder, new FileLocator(self::$fixturesPath.'/xml'));
         $loader->load('services2.xml');
 
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         $this->assertGreaterThan(0, $containerBuilder->getParameterBag()->all(), 'Parameters can be read from the config file.');
     }
diff --git a/src/Symfony/Component/DomCrawler/Crawler.php b/src/Symfony/Component/DomCrawler/Crawler.php
index 1f8f993324..9a0a46e1ca 100644
--- a/src/Symfony/Component/DomCrawler/Crawler.php
+++ b/src/Symfony/Component/DomCrawler/Crawler.php
@@ -182,7 +182,9 @@ class Crawler implements \Countable, \IteratorAggregate
     public function addHtmlContent($content, $charset = 'UTF-8')
     {
         $internalErrors = libxml_use_internal_errors(true);
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
 
         $dom = new \DOMDocument('1.0', $charset);
         $dom->validateOnParse = true;
@@ -203,7 +205,9 @@ class Crawler implements \Countable, \IteratorAggregate
         }
 
         libxml_use_internal_errors($internalErrors);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         $this->addDocument($dom);
 
@@ -246,7 +250,9 @@ class Crawler implements \Countable, \IteratorAggregate
         }
 
         $internalErrors = libxml_use_internal_errors(true);
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
 
         $dom = new \DOMDocument('1.0', $charset);
         $dom->validateOnParse = true;
@@ -256,7 +262,9 @@ class Crawler implements \Countable, \IteratorAggregate
         }
 
         libxml_use_internal_errors($internalErrors);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         $this->addDocument($dom);
 
diff --git a/src/Symfony/Component/Serializer/Encoder/XmlEncoder.php b/src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
index fc4cbe5d83..412dbb2f37 100644
--- a/src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
+++ b/src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
@@ -83,14 +83,18 @@ class XmlEncoder extends SerializerAwareEncoder implements EncoderInterface, Dec
         }
 
         $internalErrors = libxml_use_internal_errors(true);
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
         libxml_clear_errors();
 
         $dom = new \DOMDocument();
         $dom->loadXML($data, $this->loadOptions);
 
         libxml_use_internal_errors($internalErrors);
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         if ($error = libxml_get_last_error()) {
             libxml_clear_errors();
diff --git a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
index 14a2668c27..00b56f9d56 100644
--- a/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
+++ b/src/Symfony/Component/Translation/Loader/XliffFileLoader.php
@@ -189,15 +189,17 @@ class XliffFileLoader implements LoaderInterface
     {
         $internalErrors = libxml_use_internal_errors(true);
 
-        $disableEntities = libxml_disable_entity_loader(false);
-
-        if (!@$dom->schemaValidateSource($schema)) {
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(false);
+            $isValid = @$dom->schemaValidateSource($schema);
             libxml_disable_entity_loader($disableEntities);
-
-            throw new InvalidResourceException(sprintf('Invalid resource provided: "%s"; Errors: ', $file).implode("\n", $this->getXmlErrors($internalErrors)));
+        } else {
+            $isValid = @$dom->schemaValidateSource($schema);
         }
 
-        libxml_disable_entity_loader($disableEntities);
+        if (!$isValid) {
+            throw new InvalidResourceException(sprintf('Invalid resource provided: "%s"; Errors: ', $file).implode("\n", $this->getXmlErrors($internalErrors)));
+        }
 
         $dom->normalizeDocument();
 
diff --git a/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php b/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
index 3dcff7b09f..ffec907537 100644
--- a/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
+++ b/src/Symfony/Component/Translation/Tests/Loader/XliffFileLoaderTest.php
@@ -49,13 +49,17 @@ class XliffFileLoaderTest extends TestCase
 
     public function testLoadWithExternalEntitiesDisabled()
     {
-        $disableEntities = libxml_disable_entity_loader(true);
+        if (LIBXML_VERSION < 20900) {
+            $disableEntities = libxml_disable_entity_loader(true);
+        }
 
         $loader = new XliffFileLoader();
         $resource = __DIR__.'/../fixtures/resources.xlf';
         $catalogue = $loader->load($resource, 'en', 'domain1');
 
-        libxml_disable_entity_loader($disableEntities);
+        if (LIBXML_VERSION < 20900) {
+            libxml_disable_entity_loader($disableEntities);
+        }
 
         $this->assertEquals('en', $catalogue->getLocale());
         $this->assertEquals([new FileResource($resource)], $catalogue->getResources());