diff --git a/composer.json b/composer.json
index b7a6445d..ee2be881 100644
--- a/composer.json
+++ b/composer.json
@@ -53,6 +53,7 @@
     "typo3/cms-taskcenter": "^9.5",
     "typo3/cms-tstemplate": "^9.5",
     "typo3/cms-viewpage": "^9.5",
+    "wazum/pagetree-resizable": "^1.2",
     "yohang/calendr": "^2.1"
   },
   "scripts": {
diff --git a/composer.lock b/composer.lock
index 50d4e69c..a5a1c718 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "63ee00ca1b21b36103d80334fc23aa1d",
+    "content-hash": "43ff1e099d6b3f1ded82923c05a3e7f8",
     "packages": [
         {
             "name": "algo26-matthias/idna-convert",
@@ -5015,6 +5015,34 @@
             "description": "The TYPO3 Fluid template rendering engine",
             "time": "2019-05-07T07:07:18+00:00"
         },
+        {
+            "name": "wazum/pagetree-resizable",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/wazum/pagetree-resizable.git",
+                "reference": "8d47676cc863d4e9878723134536cd0ed6d0241f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/wazum/pagetree-resizable/zipball/8d47676cc863d4e9878723134536cd0ed6d0241f",
+                "reference": "8d47676cc863d4e9878723134536cd0ed6d0241f",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0.0",
+                "typo3/cms-core": ">=8.7.0,<9.5.99"
+            },
+            "type": "typo3-cms-extension",
+            "autoload": {
+                "psr-4": {
+                    "Wazum\\PagetreeResizable\\": "Classes"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "description": "Make the backend page tree horizontally resizable",
+            "time": "2018-11-26T06:55:42+00:00"
+        },
         {
             "name": "yohang/calendr",
             "version": "2.1.2",