diff --git a/Doc/changelog.docu b/Doc/changelog.docu
index b0f0d082..1d1e4814 100644
--- a/Doc/changelog.docu
+++ b/Doc/changelog.docu
@@ -7,7 +7,7 @@
 
 <!-- --------------------------------------------------------------------- -->
 
-<tr valign=top><td><b>2.4</b> (?/?/?,Rev.777)</td><td>
+<tr valign=top><td><b>2.3.1</b> (2012/12/20,Rev.778)</td><td>
 
 <b>Core</b>
 <ul>
diff --git a/README b/README
index bd9d7041..f982e730 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-OpenMesh, 2.4.0
+OpenMesh, 2.3.1
 ~~~~~~~~~~~~~~~
 
 0. Licence
diff --git a/VERSION b/VERSION
index 416ac60d..21d4f165 100644
--- a/VERSION
+++ b/VERSION
@@ -1,6 +1,6 @@
-VERSION=2.4
+VERSION=2.3.1
 MAJOR=2
-MINOR=4
-PATCH=0
+MINOR=3
+PATCH=1
 ID=OPENMESH
 
diff --git a/release.howto b/release.howto
index 1871162e..3c8118f9 100644
--- a/release.howto
+++ b/release.howto
@@ -1,6 +1,6 @@
 1. check files, build on windows,mac,linux with cmake and qmake
 2. check files with release numbers:
-   Docu/history.docu
+   Doc/changelog.docu
    System/config.h
    CHANGELOG
    README
diff --git a/src/OpenMesh/Core/System/config.h b/src/OpenMesh/Core/System/config.h
index 364dbf0f..310eb28a 100644
--- a/src/OpenMesh/Core/System/config.h
+++ b/src/OpenMesh/Core/System/config.h
@@ -57,7 +57,7 @@
 
 // ----------------------------------------------------------------------------
 
-#define OM_VERSION 0x20400
+#define OM_VERSION 0x20301
 
 // only defined, if it is a beta version
 //#define OM_VERSION_BETA 4