diff --git a/composer.json b/composer.json
index ae312eb..31d2639 100644
--- a/composer.json
+++ b/composer.json
@@ -1,9 +1,8 @@
 {
     "name": "php-pm/httpkernel-adapter",
-    "minimum-stability": "dev",
-    "prefer-stable": true,
+    "license": "MIT",
     "require": {
-        "php-pm/php-pm": "*",
+        "php-pm/php-pm": "^1.0",
         "symfony/http-foundation": "^2.6|^3.0",
         "symfony/http-kernel": "^2.6|^3.0",
         "ringcentral/psr7": "^1.2"