diff --git a/composer.json b/composer.json
index 4a5da0d..b05e849 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "bower-asset/bootstrap": "3.3.* | 3.2.* | 3.1.*"
     },
     "autoload": {