diff --git a/lib/Component/VCard.php b/lib/Component/VCard.php
index 6bbec5717..70144f283 100644
--- a/lib/Component/VCard.php
+++ b/lib/Component/VCard.php
@@ -130,6 +130,13 @@ class VCard extends VObject\Document
         'HOBBY' => VObject\Property\FlatText::class,
         'INTEREST' => VObject\Property\FlatText::class,
         'ORG-DIRECTORY' => VObject\Property\FlatText::class,
+
+        // rfc9554 properties
+        'CREATED' => VObject\Property\VCard\TimeStamp::class,
+        'GRAMGENDER' => VObject\Property\FlatText::class,
+        'LANGUAGE' => VObject\Property\VCard\LanguageTag::class,
+        'PRONOUNS' => VObject\Property\FlatText::class,
+        'SOCIALPROFILE' => VObject\Property\Uri::class,
     ];
 
     /**
@@ -324,6 +331,11 @@ public function getValidationRules(): array
             'CALURI' => '*',
             'CATEGORIES' => '*',
             'CLIENTPIDMAP' => '*',
+            'CREATED' => '?',
+            'GRAMGENDER' => '*',
+            'LANGUAGE' => '?',
+            'PRONOUNS' => '*',
+            'SOCIALPROFILE' => '*',
             'EMAIL' => '*',
             'FBURL' => '*',
             'IMPP' => '*',
diff --git a/tests/VObject/Component/VCardRfc9554Test.php b/tests/VObject/Component/VCardRfc9554Test.php
new file mode 100644
index 000000000..4ec536fb7
--- /dev/null
+++ b/tests/VObject/Component/VCardRfc9554Test.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace Sabre\VObject\Component;
+
+use PHPUnit\Framework\TestCase;
+use Sabre\VObject;
+
+class VCardRfc9554Test extends TestCase
+{
+    private function read(string $properties): VCard
+    {
+        return VObject\Reader::read("BEGIN:VCARD\r\nVERSION:4.0\r\nFN:Jane Doe\r\nUID:example\r\n".$properties."\r\nEND:VCARD\r\n");
+    }
+
+    public function testPropertyTypesAndRoundTrip(): void
+    {
+        $card = $this->read(implode("\r\n", [
+            'CREATED:20220705T093412Z',
+            'GRAMGENDER;LANGUAGE=de:feminine',
+            'LANGUAGE:de-AT',
+            'PRONOUNS;LANGUAGE=en;PREF=1:they/them',
+            'SOCIALPROFILE;SERVICE-TYPE=Mastodon;USERNAME=Jane:https://example.com/@Jane',
+            'SOCIALPROFILE;SERVICE-TYPE=SomeSite;VALUE=text:Jane94',
+        ]));
+        self::assertSame('TIMESTAMP', $card->CREATED->getValueType());
+        self::assertSame('TEXT', $card->GRAMGENDER->getValueType());
+        self::assertSame('LANGUAGE-TAG', $card->LANGUAGE->getValueType());
+        self::assertInstanceOf(VObject\Property\FlatText::class, $card->PRONOUNS);
+        $profiles = array_values($card->select('SOCIALPROFILE'));
+        self::assertSame('URI', $profiles[0]->getValueType());
+        self::assertSame('TEXT', $profiles[1]->getValueType());
+        self::assertSame([], $card->validate());
+        self::assertSame($card->serialize(), VObject\Reader::read($card->serialize())->serialize());
+        $json = VObject\Writer::writeJson($card);
+        self::assertSame($json, VObject\Writer::writeJson(VObject\Reader::readJson($json)));
+    }
+
+    public function testExtendedComponentsAndParameters(): void
+    {
+        $card = $this->read(implode("\r\n", [
+            'N;PROP-ID=name;SORT-AS=Doe,Jane:Doe;Jane;;;Jr.;Smith;Jr.',
+            'ADR;TYPE=billing,delivery;LABEL="123 Main Street^nAny Town";PROP-ID=address:;;123 Main Street;Any Town;CA;91921;U.S.A.;;;;123;Main Street;;;;;;',
+            'NOTE;AUTHOR="mailto:jane@example.com";AUTHOR-NAME="Jane: Doe";CREATED=20221122T151823Z:A note',
+            'FN;DERIVED=true:Jane Doe',
+        ]));
+        // FN is already present in the fixture.
+        $names = $card->select('FN');
+        $card->remove('FN');
+        $card->add(end($names));
+        self::assertCount(7, $card->N->getParts());
+        self::assertCount(18, $card->ADR->getParts());
+        self::assertTrue($card->ADR['TYPE']->has('billing'));
+        self::assertTrue($card->ADR['TYPE']->has('delivery'));
+        self::assertSame("123 Main Street\nAny Town", (string) $card->ADR['LABEL']);
+        self::assertSame([], $card->validate());
+        $roundTrip = VObject\Reader::read($card->serialize());
+        self::assertSame($card->N->getParts(), $roundTrip->N->getParts());
+        self::assertSame($card->ADR->getParts(), $roundTrip->ADR->getParts());
+        $jsonCard = VObject\Reader::readJson(VObject\Writer::writeJson($card));
+        self::assertSame($card->N->getParts(), $jsonCard->N->getParts());
+        self::assertSame($card->ADR->getParts(), $jsonCard->ADR->getParts());
+    }
+
+    public function testPhoneticAlternatives(): void
+    {
+        $card = $this->read(implode("\r\n", [
+            'N;ALTID=1;LANGUAGE=zh-Hant:孫;中山;文,逸仙;;;;',
+            'N;ALTID=1;PHONETIC=jyut;SCRIPT=Latn;LANGUAGE=yue:syun1;zung1saan1;man4,jat6sin1;;;;',
+            'N;ALTID=1;PHONETIC=script;SCRIPT=Latn:Sun;Zhongshan;;;;;',
+        ]));
+        $roundTrip = VObject\Reader::read($card->serialize());
+        self::assertCount(3, $roundTrip->select('N'));
+        self::assertSame($card->serialize(), $roundTrip->serialize());
+        self::assertSame(
+            VObject\Writer::writeJson($card),
+            VObject\Writer::writeJson(VObject\Reader::readJson(VObject\Writer::writeJson($card)))
+        );
+    }
+
+    public function testCreatedCardinality(): void
+    {
+        $card = $this->read("CREATED:20220705T093412Z\r\nCREATED:20220706T093412Z");
+        self::assertContains(
+            'CREATED MUST NOT appear more than once in a VCARD component',
+            array_column($card->validate(), 'message')
+        );
+    }
+
+    public function testLanguageCardinality(): void
+    {
+        $card = $this->read("LANGUAGE:en\r\nLANGUAGE:de");
+        self::assertContains(
+            'LANGUAGE MUST NOT appear more than once in a VCARD component',
+            array_column($card->validate(), 'message')
+        );
+    }
+
+    public function testRepeatableProperties(): void
+    {
+        $card = $this->read(implode("\r\n", [
+            'GRAMGENDER;LANGUAGE=de:feminine',
+            'GRAMGENDER;LANGUAGE=en:common',
+            'PRONOUNS;LANGUAGE=en;PREF=1:they/them',
+            'PRONOUNS;LANGUAGE=en;PREF=2:xe/xir',
+            'SOCIALPROFILE:https://example.com/one',
+            'SOCIALPROFILE:https://example.com/two',
+        ]));
+        self::assertSame([], $card->validate());
+        foreach (['GRAMGENDER', 'PRONOUNS', 'SOCIALPROFILE'] as $name) {
+            self::assertCount(2, $card->select($name));
+        }
+    }
+}