diff --git a/README.md b/README.md
index 7be29f77763..fff5b61064a 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ It can:
 ## Install
 
 ```bash
-composer require --dev rector/rector @dev nikic/php-parser '4.0.x-dev'
+composer require --dev rector/rector 'dev-master' nikic/php-parser '4.0.x-dev'
 ```
 
 Do you have old PHP or dependencies in conflict? Ok, [it is not problem](/docs/HowUseWithOldPhp.md).