diff --git a/composer.json b/composer.json
index e09d3a61..0a9e76c8 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
   ],
   "require": {
     "php": "^7.1",
-    "ergebnis/classy": "~0.5.1",
+    "ergebnis/classy": "~1.0.0",
     "fzaninotto/faker": "^1.9.0"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index 59f0b23d..dde63a42 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": "129ef429b3d94fa086879718c581088e",
+    "content-hash": "f6f988059cd41c26331e0f9cf769f9de",
     "packages": [
         {
             "name": "ergebnis/classy",
-            "version": "0.5.2",
+            "version": "1.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ergebnis/classy.git",
-                "reference": "e8e1b6f17c82389eb1d232acd6aac290286b3259"
+                "reference": "a763926a0a1e908cc30317494ea8bba6440e41e7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ergebnis/classy/zipball/e8e1b6f17c82389eb1d232acd6aac290286b3259",
-                "reference": "e8e1b6f17c82389eb1d232acd6aac290286b3259",
+                "url": "https://api.github.com/repos/ergebnis/classy/zipball/a763926a0a1e908cc30317494ea8bba6440e41e7",
+                "reference": "a763926a0a1e908cc30317494ea8bba6440e41e7",
                 "shasum": ""
             },
             "require": {
@@ -25,17 +25,20 @@
                 "php": "^7.1"
             },
             "require-dev": {
-                "ergebnis/composer-normalize": "^1.3.1",
-                "ergebnis/phpstan-rules": "~0.13.0",
+                "ergebnis/composer-normalize": "^2.2.2",
+                "ergebnis/license": "~0.1.0",
+                "ergebnis/php-cs-fixer-config": "^2.0.0",
+                "ergebnis/phpstan-rules": "~0.14.2",
                 "ergebnis/test-util": "~0.7.0",
                 "infection/infection": "~0.13.6",
-                "localheinz/php-cs-fixer-config": "~1.24.0",
                 "phpbench/phpbench": "~0.16.10",
                 "phpstan/extension-installer": "^1.0.3",
-                "phpstan/phpstan": "~0.11.19",
-                "phpstan/phpstan-deprecation-rules": "~0.11.2",
-                "phpstan/phpstan-strict-rules": "~0.11.1",
-                "phpunit/phpunit": "^7.5.18",
+                "phpstan/phpstan": "~0.12.7",
+                "phpstan/phpstan-deprecation-rules": "~0.12.2",
+                "phpstan/phpstan-strict-rules": "~0.12.2",
+                "phpunit/phpunit": "^7.5.20",
+                "psalm/plugin-phpunit": "~0.8.1",
+                "vimeo/psalm": "^3.8.3",
                 "zendframework/zend-file": "^2.8.3"
             },
             "type": "library",
@@ -56,7 +59,7 @@
             ],
             "description": "Provides a way to collect classy constructs from source or a directory.",
             "homepage": "https://github.com/ergebnis/classy",
-            "time": "2019-12-19T08:25:00+00:00"
+            "time": "2020-01-21T08:19:00+00:00"
         },
         {
             "name": "fzaninotto/faker",