diff --git a/CHANGELOG b/CHANGELOG
index 2f86821bf..00d57f494 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,13 @@
 CHANGELOG of OpenSlides
 http://openslides.org
 
+Version 1.3.1 (2013-01-09)
+==========================
+[http://dev.openslides.org/milestone/1.3.1]
+
+- Fixed unwanted automatical language switching on projector view if more than 
+  one browser languages send projector request to OpenSlides (#434)
+
 
 Version 1.3 (2012-12-10)
 ========================
diff --git a/README.txt b/README.txt
index 0485a2203..66c1b59f2 100644
--- a/README.txt
+++ b/README.txt
@@ -2,7 +2,7 @@
 English README file for OpenSlides
 ==================================
 
-This is OpenSlides, version 1.3.1 (unreleased).
+This is OpenSlides, version 1.3.1 (2013-01-09).
 
 
 What is OpenSlides?
diff --git a/openslides/__init__.py b/openslides/__init__.py
index 01f5bd5b7..a69da36df 100644
--- a/openslides/__init__.py
+++ b/openslides/__init__.py
@@ -5,8 +5,8 @@
     :license: GNU GPL, see LICENSE for more details.
 """
 
-VERSION = (1, 3, 1, 'alpha', 1)  # During development it is the next release
-RELEASE = False
+VERSION = (1, 3, 1, 'final', 1)  # During development it is the next release
+RELEASE = True
 
 
 def get_version(version=None, release=None):