diff --git a/INSTALL b/INSTALL
index e189fb77db..fb374804a0 100644
--- a/INSTALL
+++ b/INSTALL
@@ -4,7 +4,7 @@ Installing trytond_account_dunning_letter
 Prerequisites
 -------------
 
- * Python 2.6 or later (http://www.python.org/)
+ * Python 2.7 or later (http://www.python.org/)
  * trytond (http://www.tryton.org/)
  * trytond_account (http://www.tryton.org/)
  * trytond_party (http://www.tryton.org/)
diff --git a/setup.py b/setup.py
index 4481e06339..45e4048265 100644
--- a/setup.py
+++ b/setup.py
@@ -66,7 +66,6 @@ setup(name='trytond_account_dunning_letter',
         'Natural Language :: Slovenian',
         'Natural Language :: Spanish',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
         'Topic :: Office/Business',
         'Topic :: Office/Business :: Financial :: Accounting',