diff --git a/core/Updates/2.15.0-b20.php b/core/Updates/2.15.0-b20.php
new file mode 100644
index 0000000000000000000000000000000000000000..79b4703f1b201751d47f791305b7e4e620ca11e5
--- /dev/null
+++ b/core/Updates/2.15.0-b20.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+namespace Piwik\Updates;
+
+use Piwik\Plugin;
+use Piwik\Updater;
+use Piwik\Updates;
+
+/**
+ * Update for version 2.15.0-b20.
+ */
+class Updates_2_15_0_b20 extends Updates
+{
+
+    /**
+     * Perform the incremental version update.
+     *
+     * This method should preform all updating logic. If you define queries in an overridden `getMigrationQueries()`
+     * method, you must call {@link Updater::executeMigrationQueries()} here.
+     *
+     * See {@link Updates} for an example.
+     *
+     * @param Updater $updater
+     */
+    public function doUpdate(Updater $updater)
+    {
+        $this->makeSurePluginIsRemovedFromFilesystem('ZenMode');
+        $this->makeSurePluginIsRemovedFromFilesystem('LeftMenu');
+    }
+
+    private function makeSurePluginIsRemovedFromFilesystem($plugin)
+    {
+        Plugin\Manager::deletePluginFromFilesystem($plugin);
+    }
+}
diff --git a/core/Version.php b/core/Version.php
index e3cbcf0817539e5f436fc72ced7c1b42ed2f1ab8..8e0440536888168217fa6e3740805401b1dfac8a 100644
--- a/core/Version.php
+++ b/core/Version.php
@@ -20,7 +20,7 @@ final class Version
      * The current Piwik version.
      * @var string
      */
-    const VERSION = '2.15.0-b19';
+    const VERSION = '2.15.0-b20';
 
     public function isStableVersion($version)
     {