diff --git a/composer.json b/composer.json
index bf8a17c4..03fcb00c 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
 	"require-dev" : {
 		"monolog/monolog" : "^1.0.0 || ^2.0.0",
 		"phpunit/phpunit" : ">=7.5", 
-		"phpstan/phpstan" : "^1.5"
+		"phpstan/phpstan" : "^1.5 || ^2.0"
 	},
 	"autoload" : {
 		"files": ["source/CAS.php"],