diff --git a/composer.json b/composer.json
index 8e29f94e..eee3a803 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
     "ext-filter": "*"
   },
   "require-dev": {
-    "ergebnis/composer-normalize": "^2.8.2",
+    "ergebnis/composer-normalize": "^2.9.0",
     "ergebnis/php-cs-fixer-config": "^2.3.0",
     "ergebnis/phpstan-rules": "~0.15.2",
     "ergebnis/test-util": "^1.3.0",
diff --git a/composer.lock b/composer.lock
index 6e98120d..09541b27 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": "a7cc6de6732d7cfd09d14f3c804792a2",
+    "content-hash": "be0d9d7999f2a481cac1abd76418140b",
     "packages": [],
     "packages-dev": [
         {
@@ -683,16 +683,16 @@
         },
         {
             "name": "ergebnis/composer-normalize",
-            "version": "2.8.2",
+            "version": "2.9.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ergebnis/composer-normalize.git",
-                "reference": "0a25a226c5503659179c8ea440d1c76599e434fd"
+                "reference": "4b77c0ee53cde3d868b359b7ecadfb9797df955c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ergebnis/composer-normalize/zipball/0a25a226c5503659179c8ea440d1c76599e434fd",
-                "reference": "0a25a226c5503659179c8ea440d1c76599e434fd",
+                "url": "https://api.github.com/repos/ergebnis/composer-normalize/zipball/4b77c0ee53cde3d868b359b7ecadfb9797df955c",
+                "reference": "4b77c0ee53cde3d868b359b7ecadfb9797df955c",
                 "shasum": ""
             },
             "require": {
@@ -704,18 +704,22 @@
                 "php": "^7.2 || ^8.0"
             },
             "require-dev": {
-                "composer/composer": "^1.10.13 || ^2.0.0",
+                "composer/composer": "^1.10.15 || ^2.0.0",
                 "composer/package-versions-deprecated": "^1.11.99",
+                "ergebnis/license": "^1.1.0",
+                "ergebnis/php-cs-fixer-config": "^2.3.0",
                 "ergebnis/phpstan-rules": "~0.15.2",
-                "ergebnis/test-util": "^1.1.0",
+                "ergebnis/test-util": "^1.3.0",
                 "jangregor/phpstan-prophecy": "~0.8.0",
                 "phpstan/extension-installer": "^1.0.5",
-                "phpstan/phpstan": "~0.12.43",
+                "phpstan/phpstan": "~0.12.50",
                 "phpstan/phpstan-deprecation-rules": "~0.12.5",
                 "phpstan/phpstan-phpunit": "~0.12.16",
                 "phpstan/phpstan-strict-rules": "~0.12.5",
                 "phpunit/phpunit": "^8.5.8",
-                "symfony/filesystem": "^5.1.5"
+                "psalm/plugin-phpunit": "~0.12.2",
+                "symfony/filesystem": "^5.1.7",
+                "vimeo/psalm": "^3.18.2"
             },
             "type": "composer-plugin",
             "extra": {
@@ -750,7 +754,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-09-22T09:55:49+00:00"
+            "time": "2020-10-21T08:45:29+00:00"
         },
         {
             "name": "ergebnis/json-normalizer",