diff --git a/CMakeLists.txt b/CMakeLists.txt
index e05920c42..f9b260389 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,7 +32,7 @@ PROJECT(OpenSceneGraph)
 SET(OPENSCENEGRAPH_MAJOR_VERSION 3)
 SET(OPENSCENEGRAPH_MINOR_VERSION 1)
 SET(OPENSCENEGRAPH_PATCH_VERSION 0)
-SET(OPENSCENEGRAPH_SOVERSION 78)
+SET(OPENSCENEGRAPH_SOVERSION 90)
 
 # 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
diff --git a/include/osg/Version b/include/osg/Version
index 07a82ab60..c09fbc614 100644
--- a/include/osg/Version
+++ b/include/osg/Version
@@ -21,7 +21,7 @@ extern "C" {
 #define OPENSCENEGRAPH_MAJOR_VERSION    3
 #define OPENSCENEGRAPH_MINOR_VERSION    1
 #define OPENSCENEGRAPH_PATCH_VERSION    0
-#define OPENSCENEGRAPH_SOVERSION        78
+#define OPENSCENEGRAPH_SOVERSION        90
 
 /* Convenience macro that can be used to decide whether a feature is present or not i.e.
  * #if OSG_MIN_VERSION_REQUIRED(2,9,5)