diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5204cadc1..e4f8d5718 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,7 +32,7 @@ PROJECT(OpenSceneGraph)
 SET(OPENSCENEGRAPH_MAJOR_VERSION 2)
 SET(OPENSCENEGRAPH_MINOR_VERSION 9)
 SET(OPENSCENEGRAPH_PATCH_VERSION 12)
-SET(OPENSCENEGRAPH_SOVERSION 72)
+SET(OPENSCENEGRAPH_SOVERSION 73)
 
 # set to 0 when not a release candidate, non zero means that any generated 
 # svn tags will be treated as release candidates of given number