diff --git a/composer.json b/composer.json
index 9a1adf9..a63f2dc 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     },
     "scripts": {
         "phpstan": "phpstan analyse -c tests/phpstan.neon -l 3 src/",
-        "phpstan-setup": "cp composer.json composer.backup && composer.phar require --dev phpstan/phpstan:^0.10.1 && mv composer.backup composer.json",
+        "phpstan-setup": "cp composer.json composer.backup && composer require --dev phpstan/phpstan:^0.10.1 && mv composer.backup composer.json",
         "test": "php phpunit.phar",
         "test-setup": "[ ! -f phpunit.phar ] && wget https://phar.phpunit.de/phpunit-6.5.13.phar && mv phpunit-6.5.13.phar phpunit.phar || true",
         "test-coverage": "php phpunit.phar --log-junit webroot/coverage/unitreport.xml --coverage-html webroot/coverage --coverage-clover webroot/coverage/coverage.xml",