diff --git a/composer.json b/composer.json
index 8f75062..b8621ed 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
 		"mathematicator-core/numbers": "^2.1"
 	},
 	"require-dev": {
-		"phpstan/phpstan": "^0.12.74",
+		"phpstan/phpstan": "^0.12.74 || ^1.0.0",
 		"tracy/tracy": "^2.8",
 		"phpstan/phpstan-nette": "^0.12.14",
 		"spaze/phpstan-disallowed-calls": "^1.1",