Try again with local packages.

composer.json

@@ -103,13 +103,18 @@
   },
   "require-dev": {
     "barryvdh/laravel-ide-helper": "2.*",
+    "ergebnis/phpstan-rules": "^0.15.0",
     "filp/whoops": "2.*",
     "fzaninotto/faker": "1.*",
     "johnkary/phpunit-speedtrap": "^3.1",
     "mockery/mockery": "1.*",
+    "nunomaduro/larastan": "^0.6.2",
+    "phpstan/phpstan": "^0.12.34",
+    "phpstan/phpstan-deprecation-rules": "^0.12.5",
     "phpunit/phpunit": "^8.5",
     "psalm/plugin-laravel": "^1.1",
     "roave/security-advisories": "dev-master",
+    "thecodingmachine/phpstan-strict-rules": "^0.12.0",
     "vimeo/psalm": "^3.10"
   },
   "suggest": {