diff --git a/composer.json b/composer.json
index 801c89f..4588c09 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,10 @@
     "esoko/soko-web": "0.1",
     "fzaninotto/faker": "^1.9"
   },
+  "require-dev": {
+    "phpunit/phpunit": "^9.6",
+    "phpstan/phpstan": "^1.10"
+  },
   "autoload": {
     "psr-4": {
       "MapGuesser\\": "src"