diff --git a/doc/01-Installation.md b/doc/01-Installation.md
index d1bced4..4c8f86f 100644
--- a/doc/01-Installation.md
+++ b/doc/01-Installation.md
@@ -4,7 +4,7 @@
 Requirements
 ------------
 
-* Icinga Web 2 (>= 2.4.1)
+* Icinga Web 2 (>= 2.5.1)
 * PHP (>= 5.4 or 7.x)
 
 The Icinga Web 2 `monitoring` module needs to be configured and enabled.
diff --git a/library/Businessprocess/Web/Url.php b/library/Businessprocess/Web/Url.php
index 594603e..3c036d4 100644
--- a/library/Businessprocess/Web/Url.php
+++ b/library/Businessprocess/Web/Url.php
@@ -14,15 +14,6 @@ use Icinga\Web\Url as WebUrl;
  */
 class Url extends WebUrl
 {
-    public function setBasePath($basePath)
-    {
-        if (property_exists($this, 'basePath')) {
-            parent::setBasePath($basePath);
-        } else {
-            return $this->setBaseUrl($basePath);
-        }
-    }
-
     protected static function getRequest()
     {
         $app = Icinga::app();