diff --git a/CMakeLists.txt b/CMakeLists.txt
index 868903cf8..8cd4bd4d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,7 +32,7 @@ PROJECT (mmg)
 ###############################################################################
 SET (CMAKE_RELEASE_VERSION_MAJOR "5" )
 SET (CMAKE_RELEASE_VERSION_MINOR "1" )
-SET (CMAKE_RELEASE_VERSION_PATCH "0-beta4" )
+SET (CMAKE_RELEASE_VERSION_PATCH "0-beta5" )
 SET (CMAKE_RELEASE_DATE "Dec 4, 2015" )
 
 SET (CMAKE_RELEASE_VERSION
diff --git a/src/common/mmgcommon.h b/src/common/mmgcommon.h
index ba3e7efb5..13c988019 100644
--- a/src/common/mmgcommon.h
+++ b/src/common/mmgcommon.h
@@ -55,7 +55,7 @@ extern "C" {
 #include "eigenv.h"
 #include "libmmgcommon.h"
 
-#define MG_VER   "5.1.0-beta4"
+#define MG_VER   "5.1.0-beta5"
 #define MG_REL   "Dec 4, 2015"
 #define MG_CPY   "Copyright (c) IMB-LJLL, 2004-"
 #define MG_STR   "&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&"