diff --git a/composer.json b/composer.json
index 3507573..108d12d 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "6.5.14",
-    "phpstan/phpstan": "0.12.99"
+    "phpstan/phpstan": "1.4.6"
   },
   "autoload": {
     "psr-4": {