diff --git a/composer.json b/composer.json
index 37d50ade8..cecf888a8 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,6 @@
         "ext-hash": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
-        "ext-simplexml": "*",
         "ext-xmlreader": "*",
         "ext-zlib": "*",
         "composer-runtime-api": "^2.1",
@@ -274,9 +273,6 @@
         ]
     },
     "extra": {
-        "aws/aws-sdk-php": [
-            "S3"
-        ],
         "google/apiclient-services": [
             "Sheets"
         ]
diff --git a/src/adapter/etl-adapter-xml/composer.json b/src/adapter/etl-adapter-xml/composer.json
index cdc1ee715..78c89e6b8 100644
--- a/src/adapter/etl-adapter-xml/composer.json
+++ b/src/adapter/etl-adapter-xml/composer.json
@@ -14,7 +14,6 @@
         "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
         "ext-dom": "*",
         "ext-xmlreader": "*",
-        "ext-simplexml": "*",
         "flow-php/etl": "^0.8 || 1.x-dev"
     },
     "config": {
diff --git a/src/adapter/etl-adapter-xml/src/Flow/ETL/Adapter/XML/XMLWriter/SimpleXMLWriter.php b/src/adapter/etl-adapter-xml/src/Flow/ETL/Adapter/XML/XMLWriter/SimpleXMLWriter.php
deleted file mode 100644
index 0c9399f14..000000000
--- a/src/adapter/etl-adapter-xml/src/Flow/ETL/Adapter/XML/XMLWriter/SimpleXMLWriter.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Flow\ETL\Adapter\XML\XMLWriter;
-
-use Flow\ETL\Adapter\XML\Abstraction\{XMLAttribute, XMLNode};
-use Flow\ETL\Adapter\XML\XMLWriter;
-use Flow\ETL\Exception\RuntimeException;
-
-final class SimpleXMLWriter implements XMLWriter
-{
-    public function write(XMLNode $node) : string
-    {
-        $xml = new \SimpleXMLElement("<{$node->name}></{$node->name}>");
-        $this->buildXMLNode($xml, $node);
-
-        return \trim(\str_replace('<?xml version="1.0"?>', '', (string) $xml->asXML()));
-    }
-
-    private function addAttribute(\SimpleXMLElement $element, XMLAttribute $attribute) : void
-    {
-        $element->addAttribute($attribute->name, $attribute->value);
-    }
-
-    private function buildXMLNode(\SimpleXMLElement $element, XMLNode $node) : void
-    {
-        if ($node->hasValue()) {
-            /** @phpstan-ignore-next-line */
-            $element[0] = $node->value;
-        }
-
-        foreach ($node->attributes as $attribute) {
-            $this->addAttribute($element, $attribute);
-        }
-
-        if ($node->hasChildren()) {
-            foreach ($node->children as $child) {
-                $childElement = $element->addChild($child->name);
-
-                if ($childElement === null) {
-                    throw new RuntimeException("Can't add child element to XML node");
-                }
-
-                $this->buildXMLNode($childElement, $child);
-            }
-        }
-    }
-}
diff --git a/src/adapter/etl-adapter-xml/tests/Flow/ETL/Adapter/XML/Tests/Unit/XMLWriter/SimpleXMLWriterTest.php b/src/adapter/etl-adapter-xml/tests/Flow/ETL/Adapter/XML/Tests/Unit/XMLWriter/SimpleXMLWriterTest.php
deleted file mode 100644
index c0b446f60..000000000
--- a/src/adapter/etl-adapter-xml/tests/Flow/ETL/Adapter/XML/Tests/Unit/XMLWriter/SimpleXMLWriterTest.php
+++ /dev/null
@@ -1,81 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Flow\ETL\Adapter\XML\Tests\Unit\XMLWriter;
-
-use Flow\ETL\Adapter\XML\Abstraction\{XMLAttribute, XMLNode};
-use Flow\ETL\Adapter\XML\XMLWriter\SimpleXMLWriter;
-use PHPUnit\Framework\TestCase;
-
-final class SimpleXMLWriterTest extends TestCase
-{
-    public function test_writing_empty_child_node() : void
-    {
-        $xmlWriter = new SimpleXMLWriter();
-
-        self::assertEquals(
-            '<root><child/></root>',
-            $xmlWriter->write(
-                XMLNode::nestedNode('root')
-                    ->append(XMLNode::nestedNode('child'))
-            )
-        );
-    }
-
-    public function test_writing_empty_node() : void
-    {
-        $xmlWriter = new SimpleXMLWriter();
-
-        self::assertEquals(
-            '<root/>',
-            $xmlWriter->write(
-                XMLNode::nestedNode('root')
-            )
-        );
-    }
-
-    public function test_writing_xml() : void
-    {
-        $xmlWriter = new SimpleXMLWriter();
-
-        self::assertEquals(
-            '<root><child>value</child><child_with_children><child>value</child><child>value</child></child_with_children></root>',
-            $xmlWriter->write(
-                XMLNode::nestedNode('root')
-                    ->append(XMLNode::flatNode('child', 'value'))
-                    ->append(
-                        XMLNode::nestedNode('child_with_children')
-                            ->append(XMLNode::flatNode('child', 'value'))
-                            ->append(XMLNode::flatNode('child', 'value'))
-                    )
-            )
-        );
-    }
-
-    public function test_writing_xml_with_attribute() : void
-    {
-        $xmlWriter = new SimpleXMLWriter();
-
-        self::assertEquals(
-            '<root attribute="value">value</root>',
-            $xmlWriter->write(
-                XMLNode::flatNode('root', 'value')
-                    ->appendAttribute(new XMLAttribute('attribute', 'value'))
-            )
-        );
-    }
-
-    public function test_writing_xml_with_empty_attribute() : void
-    {
-        $xmlWriter = new SimpleXMLWriter();
-
-        self::assertEquals(
-            '<root attribute="">value</root>',
-            $xmlWriter->write(
-                XMLNode::flatNode('root', 'value')
-                    ->appendAttribute(new XMLAttribute('attribute', ''))
-            )
-        );
-    }
-}
diff --git a/src/core/etl/composer.json b/src/core/etl/composer.json
index 5f7bbd700..4c4ae6e4a 100644
--- a/src/core/etl/composer.json
+++ b/src/core/etl/composer.json
@@ -49,10 +49,5 @@
             "Flow\\": "tests/Flow"
         }
     },
-    "extra": {
-        "aws/aws-sdk-php": [
-            "S3"
-        ]
-    },
     "prefer-stable": true
 }