diff --git a/composer.json b/composer.json
index 5efc832..3208bfa 100644
--- a/composer.json
+++ b/composer.json
@@ -33,10 +33,10 @@
   "require-dev": {
     "phpunit/phpunit": "^8",
     "mockery/mockery": "^1",
-    "phpstan/phpstan": "^0",
-    "phpstan/phpstan-phpunit": "^0",
-    "phpstan/phpstan-deprecation-rules": "^0",
-    "phpstan/phpstan-strict-rules": "^0"
+    "phpstan/phpstan": "^1",
+    "phpstan/phpstan-phpunit": "^1",
+    "phpstan/phpstan-deprecation-rules": "^1",
+    "phpstan/phpstan-strict-rules": "^1"
   },
   "scripts": {
     "test": [