diff --git a/src/Calendars/Calendar.php b/src/Calendars/Calendar.php
index b7b5313..a353b2a 100644
--- a/src/Calendars/Calendar.php
+++ b/src/Calendars/Calendar.php
@@ -97,6 +97,38 @@ public function addCalendar(array $params): array
 
     // ------------------------------------------------------------------------------
 
+    /**
+     * update calendar
+     *
+     * @param array $params
+     *
+     * @return array
+     */
+    public function updateCalendar(array $params): array
+    {
+        $rules   = $this->addCalendarRules();
+        $rules[] = V::key('id', V::stringType()->notEmpty());
+
+        $accessToken = $this->options->getAccessToken();
+
+        V::doValidate(V::keySet(...$rules), $params);
+        V::doValidate(V::stringType()->notEmpty(), $accessToken);
+
+        $path   = $params['id'];
+        $header = ['Authorization' => $accessToken];
+
+        unset($params['id']);
+
+        return $this->options
+            ->getSync()
+            ->setPath($path)
+            ->setFormParams($params)
+            ->setHeaderParams($header)
+            ->put(API::LIST['oneCalendar']);
+    }
+
+    // ------------------------------------------------------------------------------
+
     /**
      * get calendar
      *
@@ -138,6 +170,47 @@ public function getCalendar($calendarId): array
 
     // ------------------------------------------------------------------------------
 
+    /**
+     * delete calendar
+     *
+     * @param mixed $contactId string|string[]
+     *
+     * @return array
+     */
+    public function deleteCalendar($contactId): array
+    {
+        $calendarId  = Helper::fooToArray($contactId);
+        $accessToken = $this->options->getAccessToken();
+
+        $rule = V::simpleArray(V::stringType()->notEmpty());
+
+        V::doValidate($rule, $calendarId);
+        V::doValidate(V::stringType()->notEmpty(), $accessToken);
+
+        $queues = [];
+        $target = API::LIST['oneCalendar'];
+        $header = ['Authorization' => $accessToken];
+
+        foreach ($calendarId as $id)
+        {
+            $request = $this->options
+                ->getAsync()
+                ->setPath($id)
+                ->setHeaderParams($header);
+
+            $queues[] = static function () use ($request, $target)
+            {
+                return $request->delete($target);
+            };
+        }
+
+        $pools = $this->options->getAsync()->pool($queues, false);
+
+        return Helper::concatPoolInfos($calendarId, $pools);
+    }
+
+    // ------------------------------------------------------------------------------
+
     /**
      * rules for add calendar
      *
diff --git a/tests/CalendarTest.php b/tests/CalendarTest.php
index 8a97d30..e582f03 100644
--- a/tests/CalendarTest.php
+++ b/tests/CalendarTest.php
@@ -52,6 +52,47 @@ public function testAddCalendar(): void
 
     // ------------------------------------------------------------------------------
 
+    public function testUpdateCalendar(): void
+    {
+        $data = $this->client->Calendars()->Calendar()->addCalendar($this->getCalendarInfo());
+
+        $params =
+            [
+                'id'          => $data['id'],
+                'name'        => 'Different Calendar',
+                'description' => 'This is now a different calendar.',
+                'timezone'    => 'America/Los_Angeles',
+            ];
+
+        $data = $this->client->Calendars()->Calendar()->updateContact($params);
+
+        $this->assertEquals($data['id'], $params['id']);
+        $this->assertEquals($data['name'], $params['name']);
+        $this->assertEquals($data['description'], $params['description']);
+        $this->assertEquals($data['timezone'], $params['timezone']);
+    }
+
+    // ------------------------------------------------------------------------------
+
+    public function testDeleteCalendar(): void
+    {
+        $data = $this->client->Calendars()->Calendar()->addCalendar($this->getCalendarInfo());
+
+        try
+        {
+            $back = true;
+            $this->client->Calendars()->Calendar()->deleteCalendar($data['id']);
+        }
+        catch (Exception $e)
+        {
+            $back = false;
+        }
+
+        $this->assertTrue($back);
+    }
+
+    // ------------------------------------------------------------------------------
+
     /**
      * @return array
      */
@@ -60,7 +101,7 @@ private function getCalendarInfo(): array
         return [
             'name'        => 'Test Calendar',
             'description' => 'This is a test calendar.',
-            'timezone'    => 'America/New_York'
+            'timezone'    => 'America/New_York',
             'location'    => 'Front Conference Room',
         ];
     }