diff --git a/INSTALL b/INSTALL
index 308527dfa3..f646c01113 100644
--- a/INSTALL
+++ b/INSTALL
@@ -4,7 +4,7 @@ Installing trytond_sale_shipment_cost
 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_carrier (http://www.tryton.org/)
  * trytond_sale (http://www.tryton.org/)