diff --git a/doc/INSTALL b/doc/INSTALL
index a97cadaa7..712b94a8d 100644
--- a/doc/INSTALL
+++ b/doc/INSTALL
@@ -7,7 +7,7 @@ http://www.redmine.org/
 
 == Requirements
 
-* Ruby on Rails 2.1
+* Ruby on Rails 2.2.2
 * A database:
   * MySQL (tested with MySQL 5)
   * PostgreSQL (tested with PostgreSQL 8.1)