diff --git a/composer.json b/composer.json
index 7efba96..3b89e70 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
 	],
 	"require": {
 		"php": "^7.2 || ^8.0",
-		"phpstan/phpstan": "^1.5"
+		"phpstan/phpstan": "^1.9.3"
 	},
 	"require-dev": {
 		"php-parallel-lint/php-parallel-lint": "^1.2",
diff --git a/phpstan.neon b/phpstan.neon
index e3c1480..925b0b0 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -5,5 +5,6 @@ includes:
 	- vendor/phpstan/phpstan-phpunit/extension.neon
 
 parameters:
+	deprecationRulesInstalled: true
 	excludePaths:
 		- tests/*/data/*