diff --git a/composer.json b/composer.json
index 9b619dd..2f87f7a 100644
--- a/composer.json
+++ b/composer.json
@@ -4,8 +4,8 @@
     "description": "TYPO3 rules for PHPStan",
     "license": "GPL-2.0-or-later",
     "require": {
-        "php": "^7.2 || ^8.0",
-        "phpstan/phpstan": "^0.12.44"
+        "php": "^7.2 || ^8.0 || ^8.1",
+        "phpstan/phpstan": "^0.12.99 || ^1.2.0"
     },
     "require-dev": {
         "ergebnis/composer-normalize": "^2.3",
@@ -16,6 +16,12 @@
         "typo3/cms-extbase": "^10.4 || 11.*.*@dev"
     },
     "config": {
+        "allow-plugins": {
+            "composer/package-versions-deprecated": true,
+            "typo3/class-alias-loader": true,
+            "typo3/cms-composer-installers": true,
+            "ergebnis/composer-normalize": true
+        },
         "platform": {
             "php": "7.2"
         },
diff --git a/composer.lock b/composer.lock
index 772a7c2..f590752 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d2429daa14912975daa78dec72c5ba58",
+    "content-hash": "46469f6e5b49fd1dc0cad7ab29adbcf3",
     "packages": [
         {
             "name": "phpstan/phpstan",
-            "version": "0.12.44",
+            "version": "0.12.99",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "330b45776ea77f167b150e24787412414a8fa469"
+                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/330b45776ea77f167b150e24787412414a8fa469",
-                "reference": "330b45776ea77f167b150e24787412414a8fa469",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/b4d40f1d759942f523be267a1bab6884f46ca3f7",
+                "reference": "b4d40f1d759942f523be267a1bab6884f46ca3f7",
                 "shasum": ""
             },
             "require": {
@@ -48,13 +48,17 @@
             "description": "PHPStan - PHP Static Analysis Tool",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan/issues",
-                "source": "https://github.com/phpstan/phpstan/tree/0.12.44"
+                "source": "https://github.com/phpstan/phpstan/tree/0.12.99"
             },
             "funding": [
                 {
                     "url": "https://github.com/ondrejmirtes",
                     "type": "github"
                 },
+                {
+                    "url": "https://github.com/phpstan",
+                    "type": "github"
+                },
                 {
                     "url": "https://www.patreon.com/phpstan",
                     "type": "patreon"
@@ -64,7 +68,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-09-24T15:28:47+00:00"
+            "time": "2021-09-12T20:09:55+00:00"
         }
     ],
     "packages-dev": [
@@ -8261,11 +8265,11 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.2 || ^8.0"
+        "php": "^7.2 || ^8.0 || ^8.1"
     },
     "platform-dev": [],
     "platform-overrides": {
         "php": "7.2"
     },
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.2.0"
 }