diff --git a/.travis.yml b/.travis.yml
index f16c2f8a0dc..5e4e1d57225 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: python
 python:
+    - "2.5"
     - "2.6"
     - "2.7"
 env:
diff --git a/cms/middleware/multilingual.py b/cms/middleware/multilingual.py
index 85a330f9c42..1d6c5aa35bd 100644
--- a/cms/middleware/multilingual.py
+++ b/cms/middleware/multilingual.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+from __future__ import with_statement
 from cms.test_utils.util.context_managers import SettingsOverride
 from cms.utils.i18n import get_default_language
 from django.conf import settings
diff --git a/cms/models/placeholdermodel.py b/cms/models/placeholdermodel.py
index be6c6a335a1..d921e85f1ff 100644
--- a/cms/models/placeholdermodel.py
+++ b/cms/models/placeholdermodel.py
@@ -126,8 +126,7 @@ def _get_attached_models(self):
         """
         return [field.model for field in self._get_attached_fields()]
 
-    @property
-    def page(self):
+    def page_getter(self):
         if not hasattr(self, '_page'):
             from cms.models.pagemodel import Page
             try:
@@ -136,10 +135,11 @@ def page(self):
                 self._page = None
         return self._page
 
-    @page.setter
-    def page(self, value):
+    def page_setter(self, value):
         self._page = value
 
+    page = property(page_getter, page_setter)
+
     def get_plugins_list(self):
         return list(self.get_plugins())
 
diff --git a/cms/sitemaps/cms_sitemap.py b/cms/sitemaps/cms_sitemap.py
index a013e839d30..f441fce1afb 100644
--- a/cms/sitemaps/cms_sitemap.py
+++ b/cms/sitemaps/cms_sitemap.py
@@ -1,6 +1,13 @@
 # -*- coding: utf-8 -*-
 from django.contrib.sitemaps import Sitemap
-import itertools
+
+def from_iterable(iterables):
+    """
+    Backport of itertools.chain.from_iterable
+    """
+    for it in iterables:
+        for element in it:
+            yield element
 
 class CMSSitemap(Sitemap):
     changefreq = "monthly"
@@ -15,7 +22,7 @@ def items(self):
     def lastmod(self, page):
         modification_dates = [page.changed_date, page.publication_date]
         plugins_for_placeholder = lambda placeholder: placeholder.cmsplugin_set.all()
-        plugins = itertools.chain.from_iterable(map(plugins_for_placeholder, page.placeholders.all()))
+        plugins = from_iterable(map(plugins_for_placeholder, page.placeholders.all()))
         plugin_modification_dates = map(lambda plugin: plugin.changed_date, plugins)
         modification_dates.extend(plugin_modification_dates)
         return max(modification_dates)
diff --git a/docs/index.rst b/docs/index.rst
index 2ebc0d43012..edac94d4d87 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -9,6 +9,20 @@ Welcome to django CMS's documentation!
 
 This document refers to version |release|
 
+*******
+Install
+*******
+
+.. toctree::
+    :maxdepth: 1
+
+    getting_started/installation
+    upgrade/2.3.3
+    upgrade/2.3.2
+    upgrade/2.3
+    upgrade/2.2
+    upgrade/2.1
+
 ***************
 Getting Started
 ***************
@@ -17,8 +31,6 @@ Getting Started
     :maxdepth: 2
     :numbered:
 
-    getting_started/installation
-    upgrade/index
     getting_started/tutorial
     getting_started/using_south
     getting_started/configuration
diff --git a/docs/upgrade/2.3.2.rst b/docs/upgrade/2.3.2.rst
index ed32fc638dc..907944e5666 100644
--- a/docs/upgrade/2.3.2.rst
+++ b/docs/upgrade/2.3.2.rst
@@ -7,7 +7,7 @@ What's new in 2.3.2
 *******************
 
 Google map plugin
-===================
+=================
 
 Google map plugin now supports width and height fields so that plugin size
 can be modified in the page admin or frontend editor.
diff --git a/docs/upgrade/2.3.3.rst b/docs/upgrade/2.3.3.rst
new file mode 100644
index 00000000000..f961dc2c870
--- /dev/null
+++ b/docs/upgrade/2.3.3.rst
@@ -0,0 +1,19 @@
+###################
+2.3.3 release notes
+###################
+
+*******************
+What's new in 2.3.3
+*******************
+
+Restored Python 2.5 support
+===========================
+
+2.3.3 restores Python 2.5 suppport for the django CMS.
+
+
+********************
+Pending deprecations
+********************
+
+Python 2.5 support will be dropped in django CMS 2.4.
diff --git a/docs/upgrade/index.rst b/docs/upgrade/index.rst
deleted file mode 100644
index e85b703f28b..00000000000
--- a/docs/upgrade/index.rst
+++ /dev/null
@@ -1,39 +0,0 @@
-###################################
-Upgrading a django CMS installation
-###################################
-
-*************
-2.3.2 Release
-*************
-
-.. toctree::
-    :maxdepth: 1
-
-    2.3.2
-
-***********
-2.3 Release
-***********
-
-.. toctree::
-    :maxdepth: 1
-
-    2.3
-
-***********
-2.2 Release
-***********
-
-.. toctree::
-    :maxdepth: 1
-
-    2.2
-
-******************
-Upgrade from 2.1.x
-******************
-
-.. toctree::
-    :maxdepth: 1
-
-    2.1
\ No newline at end of file