diff --git a/INSTALL b/INSTALL
index ee14053e49..b777896462 100644
--- a/INSTALL
+++ b/INSTALL
@@ -4,7 +4,7 @@ Installing trytond_project_plan
 Prerequisites
 -------------
 
- * Python 2.5 or later (http://www.python.org/)
+ * Python 2.6 or later (http://www.python.org/)
  * trytond (http://www.tryton.org/)
  * trytond_company (http://www.tryton.org/)
  * trytond_timesheet (http://www.tryton.org/)