diff --git a/src/core/etl/src/Flow/ETL/Row/Entry/JsonEntry.php b/src/core/etl/src/Flow/ETL/Row/Entry/JsonEntry.php
index fa90a6e92..2adb0dfd3 100644
--- a/src/core/etl/src/Flow/ETL/Row/Entry/JsonEntry.php
+++ b/src/core/etl/src/Flow/ETL/Row/Entry/JsonEntry.php
@@ -67,11 +67,31 @@ public static function object(string $name, array $value) : self
         return $entry;
     }
 
+    public function __serialize() : array
+    {
+        return [
+            'name' => $this->name,
+            /** @phpstan-ignore-next-line  */
+            'value' => \base64_encode(\gzcompress($this->value())),
+            'object' => $this->object,
+            'type' => $this->type,
+        ];
+    }
+
     public function __toString() : string
     {
         return $this->toString();
     }
 
+    public function __unserialize(array $data) : void
+    {
+        $this->name = $data['name'];
+        /** @phpstan-ignore-next-line  */
+        $this->value = (array) \json_decode(\gzuncompress(\base64_decode($data['value'], true)), true, flags: \JSON_THROW_ON_ERROR);
+        $this->object = $data['object'];
+        $this->type = $data['type'];
+    }
+
     public function definition() : Definition
     {
         return Definition::json($this->name, $this->type->nullable());
diff --git a/src/core/etl/src/Flow/ETL/Row/Entry/StringEntry.php b/src/core/etl/src/Flow/ETL/Row/Entry/StringEntry.php
index 611a39d13..f8c043b6d 100644
--- a/src/core/etl/src/Flow/ETL/Row/Entry/StringEntry.php
+++ b/src/core/etl/src/Flow/ETL/Row/Entry/StringEntry.php
@@ -49,11 +49,29 @@ public static function uppercase(string $name, string $value) : self
         return new self($name, \mb_strtoupper($value));
     }
 
+    public function __serialize() : array
+    {
+        return [
+            'name' => $this->name,
+            /** @phpstan-ignore-next-line  */
+            'value' => \base64_encode(\gzcompress($this->value)),
+            'type' => $this->type,
+        ];
+    }
+
     public function __toString() : string
     {
         return $this->toString();
     }
 
+    public function __unserialize(array $data) : void
+    {
+        $this->name = $data['name'];
+        /** @phpstan-ignore-next-line  */
+        $this->value = \gzuncompress(\base64_decode($data['value'], true));
+        $this->type = $data['type'];
+    }
+
     public function definition() : Definition
     {
         return Definition::string($this->name, $this->type->nullable());
diff --git a/src/core/etl/src/Flow/ETL/Row/Entry/XMLEntry.php b/src/core/etl/src/Flow/ETL/Row/Entry/XMLEntry.php
index 9304a20dc..509f8889c 100644
--- a/src/core/etl/src/Flow/ETL/Row/Entry/XMLEntry.php
+++ b/src/core/etl/src/Flow/ETL/Row/Entry/XMLEntry.php
@@ -38,12 +38,38 @@ public function __construct(private readonly string $name, \DOMDocument|string $
         $this->type = type_object($this->value::class);
     }
 
+    public function __serialize() : array
+    {
+        return [
+            'name' => $this->name,
+            /** @phpstan-ignore-next-line  */
+            'value' => \base64_encode(\gzcompress($this->value->saveXML())),
+            'type' => $this->type,
+        ];
+    }
+
     public function __toString() : string
     {
         /** @phpstan-ignore-next-line  */
         return $this->value->saveXML();
     }
 
+    public function __unserialize(array $data) : void
+    {
+        $this->name = $data['name'];
+        $this->type = $data['type'];
+        /** @phpstan-ignore-next-line  */
+        $xmlString = \gzuncompress(\base64_decode($data['value'], true));
+        $doc = new \DOMDocument();
+
+        /** @phpstan-ignore-next-line  */
+        if (!@$doc->loadXML($xmlString)) {
+            throw new InvalidArgumentException(\sprintf('Given string "%s" is not valid XML', $xmlString));
+        }
+
+        $this->value = $doc;
+    }
+
     public function definition() : Definition
     {
         return Definition::xml($this->ref(), $this->type->nullable());
diff --git a/src/core/etl/src/Flow/ETL/Row/Entry/XMLNodeEntry.php b/src/core/etl/src/Flow/ETL/Row/Entry/XMLNodeEntry.php
index b5209d1c0..7571f3ab3 100644
--- a/src/core/etl/src/Flow/ETL/Row/Entry/XMLNodeEntry.php
+++ b/src/core/etl/src/Flow/ETL/Row/Entry/XMLNodeEntry.php
@@ -23,6 +23,16 @@ public function __construct(private readonly string $name, private readonly \DOM
         $this->type = type_object($this->value::class);
     }
 
+    public function __serialize() : array
+    {
+        return [
+            'name' => $this->name,
+            /* @phpstan-ignore-next-line */
+            'value' => \base64_encode(\gzcompress($this->toString())),
+            'type' => $this->type,
+        ];
+    }
+
     public function __toString() : string
     {
         /**
@@ -33,6 +43,21 @@ public function __toString() : string
         return $this->value->ownerDocument->saveXML($this->value);
     }
 
+    public function __unserialize(array $data) : void
+    {
+        $this->name = $data['name'];
+        $this->type = $data['type'];
+
+        /* @phpstan-ignore-next-line */
+        $nodeString = \gzuncompress(\base64_decode($data['value'], true));
+        $domDocument = new \DOMDocument();
+        /* @phpstan-ignore-next-line */
+        @$domDocument->loadXML($nodeString);
+
+        /* @phpstan-ignore-next-line */
+        $this->value = (new \DOMDocument())->importNode($domDocument->documentElement, true);
+    }
+
     public function definition() : Definition
     {
         return Definition::xml_node($this->ref(), $this->type->nullable());
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/JsonEntryTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/JsonEntryTest.php
index dfbd1089c..1a3b59608 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/JsonEntryTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/JsonEntryTest.php
@@ -177,4 +177,24 @@ public function test_returns_json_as_value() : void
 
         $this->assertEquals(\json_encode($items), $entry->value());
     }
+
+    public function test_serialization() : void
+    {
+        $entry = new JsonEntry('name', ['foo' => 1, 'bar' => ['foo' => 'foo', 'bar' => 'bar'], 'baz']);
+
+        $serialized = \serialize($entry);
+        $unserialized = \unserialize($serialized);
+
+        $this->assertTrue($entry->isEqual($unserialized));
+    }
+
+    public function test_serialization_of_json_objects() : void
+    {
+        $entry = JsonEntry::object('entry-name', ['id' => 1, 'name' => 'one']);
+
+        $serialized = \serialize($entry);
+        $unserialized = \unserialize($serialized);
+
+        $this->assertTrue($entry->isEqual($unserialized));
+    }
 }
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/StringEntryTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/StringEntryTest.php
index 78b73be30..649b1cd9a 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/StringEntryTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/StringEntryTest.php
@@ -68,10 +68,13 @@ public function test_renames_entry() : void
 
     public function test_serialization() : void
     {
-        $string = new StringEntry('name', 'some string');
+        $string = new StringEntry('name', <<<'TXT'
+This is some very long
+multi-line string, including different values like: ąćżźą
+
+TXT);
 
         $serialized = \serialize($string);
-        /** @var StringEntry $unserialized */
         $unserialized = \unserialize($serialized);
 
         $this->assertTrue($string->isEqual($unserialized));
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLEntryTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLEntryTest.php
index 2cf93c49e..ec1392f1c 100644
--- a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLEntryTest.php
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLEntryTest.php
@@ -133,4 +133,27 @@ public function test_is_equal(bool $equals, XMLEntry $entry, XMLEntry $nextEntry
     {
         $this->assertSame($equals, $entry->isEqual($nextEntry));
     }
+
+    public function test_serialization() : void
+    {
+        $entry = new XMLEntry('xml', <<<'XML'
+<xml>
+    <root>
+        <item>
+            <id>1</id>
+            <name>Foo</name>
+        </item>
+        <item>
+            <id>2</id>
+            <name>Bar</name>
+        </item>
+    </root>
+</xml>
+XML);
+
+        $serialized = \serialize($entry);
+        $unserialized = \unserialize($serialized);
+
+        $this->assertTrue($entry->isEqual($unserialized));
+    }
 }
diff --git a/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLNodeEntryTest.php b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLNodeEntryTest.php
new file mode 100644
index 000000000..9d36677b1
--- /dev/null
+++ b/src/core/etl/tests/Flow/ETL/Tests/Unit/Row/Entry/XMLNodeEntryTest.php
@@ -0,0 +1,21 @@
+<?php declare(strict_types=1);
+
+namespace Flow\ETL\Tests\Unit\Row\Entry;
+
+use Flow\ETL\Row\Entry\XMLNodeEntry;
+use PHPUnit\Framework\TestCase;
+
+final class XMLNodeEntryTest extends TestCase
+{
+    public function test_serialization() : void
+    {
+        $domDocument = new \DOMDocument();
+
+        $entry = new XMLNodeEntry('node', $domDocument->createElement('testElement', 'This is a test'));
+
+        $serialized = \serialize($entry);
+        $unserialized = \unserialize($serialized);
+
+        $this->assertTrue($entry->isEqual($unserialized));
+    }
+}