diff --git a/lib/Component/VCalendar.php b/lib/Component/VCalendar.php
index 5163c042a..a106fb665 100644
--- a/lib/Component/VCalendar.php
+++ b/lib/Component/VCalendar.php
@@ -145,6 +145,10 @@ class VCalendar extends VObject\Document
 
         // Additions from draft-daboo-calendar-availability-05
         'BUSYTYPE' => Property\Text::class,
+
+        // RFC 7986 properties
+        'NAME' => Property\FlatText::class,
+        'COLOR' => Property\FlatText::class,
     ];
 
     /**
@@ -379,6 +383,18 @@ public function getValidationRules(): array
 
             'CALSCALE' => '?',
             'METHOD' => '?',
+
+            // RFC 7986 calendar properties
+            'UID' => '?',
+            'LAST-MODIFIED' => '?',
+            'URL' => '?',
+            'REFRESH-INTERVAL' => '?',
+            'SOURCE' => '?',
+            'COLOR' => '?',
+            'NAME' => '*',
+            'DESCRIPTION' => '*',
+            'CATEGORIES' => '*',
+            'IMAGE' => '*',
         ];
     }
 
diff --git a/lib/Component/VEvent.php b/lib/Component/VEvent.php
index e29e56322..c3011ed60 100644
--- a/lib/Component/VEvent.php
+++ b/lib/Component/VEvent.php
@@ -117,6 +117,7 @@ public function getValidationRules(): array
             'DTSTART' => $hasMethod ? '?' : '1',
             'CLASS' => '?',
             'CREATED' => '?',
+            'COLOR' => '?',
             'DESCRIPTION' => '?',
             'GEO' => '?',
             'LAST-MODIFIED' => '?',
@@ -137,7 +138,9 @@ public function getValidationRules(): array
             'ATTENDEE' => '*',
             'CATEGORIES' => '*',
             'COMMENT' => '*',
+            'CONFERENCE' => '*',
             'CONTACT' => '*',
+            'IMAGE' => '*',
             'EXDATE' => '*',
             'REQUEST-STATUS' => '*',
             'RELATED-TO' => '*',
diff --git a/lib/Component/VJournal.php b/lib/Component/VJournal.php
index 30e40adf7..79c14dece 100644
--- a/lib/Component/VJournal.php
+++ b/lib/Component/VJournal.php
@@ -62,6 +62,7 @@ public function getValidationRules(): array
 
             'CLASS' => '?',
             'CREATED' => '?',
+            'COLOR' => '?',
             'DTSTART' => '?',
             'LAST-MODIFIED' => '?',
             'ORGANIZER' => '?',
@@ -78,6 +79,7 @@ public function getValidationRules(): array
             'CATEGORIES' => '*',
             'COMMENT' => '*',
             'CONTACT' => '*',
+            'IMAGE' => '*',
             'DESCRIPTION' => '*',
             'EXDATE' => '*',
             'RELATED-TO' => '*',
diff --git a/lib/Component/VTodo.php b/lib/Component/VTodo.php
index cab672ce5..63cc7f018 100644
--- a/lib/Component/VTodo.php
+++ b/lib/Component/VTodo.php
@@ -98,6 +98,7 @@ public function getValidationRules(): array
             'CLASS' => '?',
             'COMPLETED' => '?',
             'CREATED' => '?',
+            'COLOR' => '?',
             'DESCRIPTION' => '?',
             'DTSTART' => '?',
             'GEO' => '?',
@@ -120,7 +121,9 @@ public function getValidationRules(): array
             'ATTENDEE' => '*',
             'CATEGORIES' => '*',
             'COMMENT' => '*',
+            'CONFERENCE' => '*',
             'CONTACT' => '*',
+            'IMAGE' => '*',
             'EXDATE' => '*',
             'REQUEST-STATUS' => '*',
             'RELATED-TO' => '*',
diff --git a/tests/VObject/Component/VCalendarRfc7986Test.php b/tests/VObject/Component/VCalendarRfc7986Test.php
new file mode 100644
index 000000000..50c7b37fe
--- /dev/null
+++ b/tests/VObject/Component/VCalendarRfc7986Test.php
@@ -0,0 +1,130 @@
+<?php
+
+namespace Sabre\VObject\Component;
+
+use PHPUnit\Framework\TestCase;
+use Sabre\VObject;
+
+class VCalendarRfc7986Test extends TestCase
+{
+    private function calendar(): VCalendar
+    {
+        $calendar = new VCalendar();
+        $calendar->add('VEVENT', ['DTSTART' => '20261004T120000Z']);
+
+        return $calendar;
+    }
+
+    public function testCalendarPropertiesAndRoundTrip(): void
+    {
+        $calendar = $this->calendar();
+        $calendar->add('NAME', 'Company Vacation Days', ['LANGUAGE' => 'en']);
+        $calendar->add('DESCRIPTION', 'Company holidays', ['LANGUAGE' => 'en']);
+        $calendar->add('UID', '5FC53010-1267-4F8E-BC28-1D7AE55A7C99');
+        $calendar->add('LAST-MODIFIED', '20261001T120000Z');
+        $calendar->add('URL', 'https://example.com/holidays');
+        $calendar->add('CATEGORIES', ['Holidays', 'Company']);
+        $calendar->add('REFRESH-INTERVAL', 'P1W', ['VALUE' => 'DURATION']);
+        $calendar->add('SOURCE', 'https://example.com/holidays.ics', ['VALUE' => 'URI']);
+        $calendar->add('COLOR', 'turquoise');
+        $calendar->add('IMAGE', 'https://example.com/images/party.png', [
+            'VALUE' => 'URI', 'DISPLAY' => ['BADGE', 'THUMBNAIL'], 'FMTTYPE' => 'image/png',
+        ]);
+        $parsed = VObject\Reader::read($calendar->serialize());
+        self::assertInstanceOf(VObject\Property\FlatText::class, $parsed->NAME);
+        self::assertInstanceOf(VObject\Property\FlatText::class, $parsed->COLOR);
+        self::assertSame('DURATION', $parsed->{'REFRESH-INTERVAL'}->getValueType());
+        self::assertSame('URI', $parsed->SOURCE->getValueType());
+        self::assertSame('URI', $parsed->IMAGE->getValueType());
+        self::assertSame([], $parsed->validate());
+        self::assertSame($calendar->serialize(), $parsed->serialize());
+        $json = VObject\Writer::writeJson($calendar);
+        self::assertSame($json, VObject\Writer::writeJson(VObject\Reader::readJson($json)));
+    }
+
+    public function testPropertiesWithoutDefaultTypesRetainValueParameters(): void
+    {
+        $calendar = $this->calendar();
+        $calendar->add('REFRESH-INTERVAL', 'P1W', ['VALUE' => 'DURATION']);
+        $calendar->add('SOURCE', 'https://example.com/calendar.ics', ['VALUE' => 'URI']);
+        $calendar->add('IMAGE', 'image bytes', ['VALUE' => 'BINARY', 'ENCODING' => 'BASE64', 'FMTTYPE' => 'image/png']);
+        $calendar->VEVENT->add('CONFERENCE', 'https://example.com/meeting', ['VALUE' => 'URI']);
+        $parsed = VObject\Reader::readJson(VObject\Writer::writeJson($calendar));
+        self::assertSame('DURATION', (string) $parsed->{'REFRESH-INTERVAL'}['VALUE']);
+        self::assertSame('URI', (string) $parsed->SOURCE['VALUE']);
+        self::assertSame('BINARY', (string) $parsed->IMAGE['VALUE']);
+        self::assertSame('image bytes', $parsed->IMAGE->getValue());
+        self::assertSame('URI', (string) $parsed->VEVENT->CONFERENCE['VALUE']);
+        self::assertSame(VObject\Writer::writeJson($calendar), VObject\Writer::writeJson($parsed));
+    }
+
+    public function testCalendarSingletonCardinalities(): void
+    {
+        $properties = [
+            'UID' => ['calendar-id', []],
+            'LAST-MODIFIED' => ['20261001T120000Z', []],
+            'URL' => ['https://example.com/calendar', []],
+            'REFRESH-INTERVAL' => ['P1W', ['VALUE' => 'DURATION']],
+            'SOURCE' => ['https://example.com/calendar.ics', ['VALUE' => 'URI']],
+            'COLOR' => ['turquoise', []],
+        ];
+        foreach ($properties as $name => [$value, $parameters]) {
+            $calendar = $this->calendar();
+            $calendar->add($name, $value, $parameters);
+            self::assertSame([], $calendar->validate(), $name);
+            $calendar->add($name, $value, $parameters);
+            self::assertContains(
+                $name.' MUST NOT appear more than once in a VCALENDAR component',
+                array_column($calendar->validate(), 'message')
+            );
+        }
+    }
+
+    public function testRepeatableCalendarProperties(): void
+    {
+        $calendar = $this->calendar();
+        foreach (['en', 'de'] as $language) {
+            $calendar->add('NAME', 'Calendar', ['LANGUAGE' => $language]);
+            $calendar->add('DESCRIPTION', 'Description', ['LANGUAGE' => $language]);
+        }
+        $calendar->add('CATEGORIES', ['Company']);
+        $calendar->add('CATEGORIES', ['Holidays']);
+        $calendar->add('IMAGE', 'https://example.com/one.png', ['VALUE' => 'URI']);
+        $calendar->add('IMAGE', 'https://example.com/two.png', ['VALUE' => 'URI']);
+        self::assertSame([], $calendar->validate());
+        foreach (['NAME', 'DESCRIPTION', 'CATEGORIES', 'IMAGE'] as $name) {
+            self::assertCount(2, $calendar->select($name));
+        }
+    }
+
+    public function testComponentPropertiesAndColorCardinality(): void
+    {
+        foreach (['VEVENT', 'VTODO', 'VJOURNAL'] as $name) {
+            $calendar = new VCalendar();
+            $component = $calendar->add($name, ['DTSTART' => '20261004T120000Z']);
+            $component->add('COLOR', 'turquoise');
+            $component->add('IMAGE', 'https://example.com/one.png', ['VALUE' => 'URI']);
+            $component->add('IMAGE', 'https://example.com/two.png', ['VALUE' => 'URI']);
+            if ('VJOURNAL' !== $name) {
+                $component->add('CONFERENCE', 'https://example.com/meeting', [
+                    'VALUE' => 'URI', 'FEATURE' => ['AUDIO', 'VIDEO'], 'LABEL' => 'Attendee dial-in',
+                ]);
+                $component->add('CONFERENCE', 'xmpp:chat@example.com', ['VALUE' => 'URI', 'FEATURE' => 'CHAT']);
+                $component->add('ATTENDEE', 'mailto:opaque-token@example.com', ['EMAIL' => 'person@example.com']);
+                $parsed = VObject\Reader::read($calendar->serialize());
+                $parsedComponent = $parsed->{$name};
+                self::assertSame('URI', $parsedComponent->CONFERENCE->getValueType());
+                self::assertTrue($parsedComponent->CONFERENCE['FEATURE']->has('VIDEO'));
+                self::assertSame('Attendee dial-in', (string) $parsedComponent->CONFERENCE['LABEL']);
+                self::assertSame('person@example.com', (string) $parsedComponent->ATTENDEE['EMAIL']);
+                self::assertCount(2, $parsedComponent->select('CONFERENCE'));
+            }
+            self::assertSame([], $calendar->validate(), $name);
+            $component->add('COLOR', 'red');
+            self::assertContains(
+                'COLOR MUST NOT appear more than once in a '.$name.' component',
+                array_column($calendar->validate(), 'message')
+            );
+        }
+    }
+}