diff --git a/extensions/sphinx/composer.json b/extensions/sphinx/composer.json
index b561ea9684..3762574d3e 100644
--- a/extensions/sphinx/composer.json
+++ b/extensions/sphinx/composer.json
@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "ext-pdo": "*",
         "ext-pdo_mysql": "*"
     },