diff --git a/composer.lock b/composer.lock
index 9eeb02ea1..4b1e1cea6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -3852,16 +3852,16 @@
         },
         {
             "name": "sabre/http",
-            "version": "5.1.7",
+            "version": "5.1.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sabre-io/http.git",
-                "reference": "b6fa04f42f49156eaab3fb890c79f4c43a9559b7"
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sabre-io/http/zipball/b6fa04f42f49156eaab3fb890c79f4c43a9559b7",
-                "reference": "b6fa04f42f49156eaab3fb890c79f4c43a9559b7",
+                "url": "https://api.github.com/repos/sabre-io/http/zipball/f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
                 "shasum": ""
             },
             "require": {
@@ -3911,7 +3911,7 @@
                 "issues": "https://github.com/sabre-io/http/issues",
                 "source": "https://github.com/fruux/sabre-http"
             },
-            "time": "2023-06-26T10:13:00+00:00"
+            "time": "2023-08-18T01:55:28+00:00"
         },
         {
             "name": "sabre/uri",
@@ -3975,16 +3975,16 @@
         },
         {
             "name": "sabre/vobject",
-            "version": "4.5.3",
+            "version": "4.5.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sabre-io/vobject.git",
-                "reference": "fe6d9183154ed6f2f913f2b568d3d51d8ae9b308"
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sabre-io/vobject/zipball/fe6d9183154ed6f2f913f2b568d3d51d8ae9b308",
-                "reference": "fe6d9183154ed6f2f913f2b568d3d51d8ae9b308",
+                "url": "https://api.github.com/repos/sabre-io/vobject/zipball/a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
                 "shasum": ""
             },
             "require": {
@@ -4075,7 +4075,7 @@
                 "issues": "https://github.com/sabre-io/vobject/issues",
                 "source": "https://github.com/fruux/sabre-vobject"
             },
-            "time": "2023-01-22T12:21:50+00:00"
+            "time": "2023-11-09T12:54:37+00:00"
         },
         {
             "name": "sabre/xml",
diff --git a/composer/installed.json b/composer/installed.json
index 9ae004e49..e4ba0cca1 100644
--- a/composer/installed.json
+++ b/composer/installed.json
@@ -4020,17 +4020,17 @@
         },
         {
             "name": "sabre/http",
-            "version": "5.1.7",
-            "version_normalized": "5.1.7.0",
+            "version": "5.1.10",
+            "version_normalized": "5.1.10.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sabre-io/http.git",
-                "reference": "b6fa04f42f49156eaab3fb890c79f4c43a9559b7"
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sabre-io/http/zipball/b6fa04f42f49156eaab3fb890c79f4c43a9559b7",
-                "reference": "b6fa04f42f49156eaab3fb890c79f4c43a9559b7",
+                "url": "https://api.github.com/repos/sabre-io/http/zipball/f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
+                "reference": "f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02",
                 "shasum": ""
             },
             "require": {
@@ -4049,7 +4049,7 @@
             "suggest": {
                 "ext-curl": " to make http requests with the Client class"
             },
-            "time": "2023-06-26T10:13:00+00:00",
+            "time": "2023-08-18T01:55:28+00:00",
             "type": "library",
             "installation-source": "dist",
             "autoload": {
@@ -4149,17 +4149,17 @@
         },
         {
             "name": "sabre/vobject",
-            "version": "4.5.3",
-            "version_normalized": "4.5.3.0",
+            "version": "4.5.4",
+            "version_normalized": "4.5.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sabre-io/vobject.git",
-                "reference": "fe6d9183154ed6f2f913f2b568d3d51d8ae9b308"
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sabre-io/vobject/zipball/fe6d9183154ed6f2f913f2b568d3d51d8ae9b308",
-                "reference": "fe6d9183154ed6f2f913f2b568d3d51d8ae9b308",
+                "url": "https://api.github.com/repos/sabre-io/vobject/zipball/a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
+                "reference": "a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772",
                 "shasum": ""
             },
             "require": {
@@ -4176,7 +4176,7 @@
             "suggest": {
                 "hoa/bench": "If you would like to run the benchmark scripts"
             },
-            "time": "2023-01-22T12:21:50+00:00",
+            "time": "2023-11-09T12:54:37+00:00",
             "bin": [
                 "bin/vobject",
                 "bin/generate_vcards"
diff --git a/composer/installed.php b/composer/installed.php
index a360901a7..0838ef0d1 100644
--- a/composer/installed.php
+++ b/composer/installed.php
@@ -3,7 +3,7 @@
         'name' => 'nextcloud/3rdparty',
         'pretty_version' => 'dev-master',
         'version' => 'dev-master',
-        'reference' => '6e16075d122c7582527e2be7e365775f0b8e5f0c',
+        'reference' => 'b735a43181ab32f3d55783d7726589928db23745',
         'type' => 'library',
         'install_path' => __DIR__ . '/../',
         'aliases' => array(),
@@ -310,7 +310,7 @@
         'nextcloud/3rdparty' => array(
             'pretty_version' => 'dev-master',
             'version' => 'dev-master',
-            'reference' => '6e16075d122c7582527e2be7e365775f0b8e5f0c',
+            'reference' => 'b735a43181ab32f3d55783d7726589928db23745',
             'type' => 'library',
             'install_path' => __DIR__ . '/../',
             'aliases' => array(),
@@ -608,9 +608,9 @@
             'dev_requirement' => false,
         ),
         'sabre/http' => array(
-            'pretty_version' => '5.1.7',
-            'version' => '5.1.7.0',
-            'reference' => 'b6fa04f42f49156eaab3fb890c79f4c43a9559b7',
+            'pretty_version' => '5.1.10',
+            'version' => '5.1.10.0',
+            'reference' => 'f9f3d1fba8916fa2f4ec25636c4fedc26cb94e02',
             'type' => 'library',
             'install_path' => __DIR__ . '/../sabre/http',
             'aliases' => array(),
@@ -626,9 +626,9 @@
             'dev_requirement' => false,
         ),
         'sabre/vobject' => array(
-            'pretty_version' => '4.5.3',
-            'version' => '4.5.3.0',
-            'reference' => 'fe6d9183154ed6f2f913f2b568d3d51d8ae9b308',
+            'pretty_version' => '4.5.4',
+            'version' => '4.5.4.0',
+            'reference' => 'a6d53a3e5bec85ed3dd78868b7de0f5b4e12f772',
             'type' => 'library',
             'install_path' => __DIR__ . '/../sabre/vobject',
             'aliases' => array(),
diff --git a/sabre/http/lib/Client.php b/sabre/http/lib/Client.php
index 2bc7483a7..0837e8d2a 100644
--- a/sabre/http/lib/Client.php
+++ b/sabre/http/lib/Client.php
@@ -402,7 +402,10 @@ protected function createCurlSettingsArray(RequestInterface $request): array
                 $nHeaders[] = $key.': '.$value;
             }
         }
-        $settings[CURLOPT_HTTPHEADER] = $nHeaders;
+
+        if ([] !== $nHeaders) {
+            $settings[CURLOPT_HTTPHEADER] = $nHeaders;
+        }
         $settings[CURLOPT_URL] = $request->getUrl();
         // FIXME: CURLOPT_PROTOCOLS is currently unsupported by HHVM
         if (defined('CURLOPT_PROTOCOLS')) {
diff --git a/sabre/http/lib/Version.php b/sabre/http/lib/Version.php
index 1c9190c59..93c64797b 100644
--- a/sabre/http/lib/Version.php
+++ b/sabre/http/lib/Version.php
@@ -16,5 +16,5 @@ class Version
     /**
      * Full version number.
      */
-    const VERSION = '5.1.7';
+    const VERSION = '5.1.10';
 }
diff --git a/sabre/vobject/lib/DateTimeParser.php b/sabre/vobject/lib/DateTimeParser.php
index 1c253437a..c5dbac97d 100644
--- a/sabre/vobject/lib/DateTimeParser.php
+++ b/sabre/vobject/lib/DateTimeParser.php
@@ -104,7 +104,7 @@ public static function parseDuration($duration, $asString = false)
         if (!$asString) {
             $invert = false;
 
-            if ('-' === $matches['plusminus']) {
+            if (isset($matches['plusminus']) && '-' === $matches['plusminus']) {
                 $invert = true;
             }
 
diff --git a/sabre/vobject/lib/ITip/Broker.php b/sabre/vobject/lib/ITip/Broker.php
index b66a59f54..80d9a5b31 100644
--- a/sabre/vobject/lib/ITip/Broker.php
+++ b/sabre/vobject/lib/ITip/Broker.php
@@ -156,9 +156,9 @@ public function processMessage(Message $itipMessage, VCalendar $existingObject =
      * people. If the user was an attendee, we need to make sure that the
      * organizer gets the 'declined' message.
      *
-     * @param VCalendar|string $calendar
-     * @param string|array     $userHref
-     * @param VCalendar|string $oldCalendar
+     * @param VCalendar|string      $calendar
+     * @param string|array          $userHref
+     * @param VCalendar|string|null $oldCalendar
      *
      * @return array
      */
diff --git a/sabre/vobject/lib/Version.php b/sabre/vobject/lib/Version.php
index 63349e47e..c7ca69e14 100644
--- a/sabre/vobject/lib/Version.php
+++ b/sabre/vobject/lib/Version.php
@@ -14,5 +14,5 @@ class Version
     /**
      * Full version number.
      */
-    public const VERSION = '4.5.3';
+    public const VERSION = '4.5.4';
 }