diff --git a/CMakeLists.txt b/CMakeLists.txt
index 19fb4d489..601154766 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 SET(OPENSCENEGRAPH_MAJOR_VERSION 3)
 SET(OPENSCENEGRAPH_MINOR_VERSION 6)
 SET(OPENSCENEGRAPH_PATCH_VERSION 0)
-SET(OPENSCENEGRAPH_SOVERSION 155)
+SET(OPENSCENEGRAPH_SOVERSION 156)
 
 
 # set to 0 when not a release candidate, non zero means that any generated
diff --git a/src/osgWrappers/serializers/osg/Drawable.cpp b/src/osgWrappers/serializers/osg/Drawable.cpp
index 42ebfb195..24e21609a 100644
--- a/src/osgWrappers/serializers/osg/Drawable.cpp
+++ b/src/osgWrappers/serializers/osg/Drawable.cpp
@@ -39,7 +39,13 @@ REGISTER_OBJECT_WRAPPER( Drawable,
          UPDATE_TO_VERSION_SCOPED( 154 )
          ADDED_ASSOCIATE("osg::Node")
     }
+
     ADD_OBJECT_SERIALIZER( StateSet, osg::StateSet, NULL );  // _stateset
+    {
+         UPDATE_TO_VERSION_SCOPED( 156 )
+         REMOVE_SERIALIZER( StateSet ) // now provided by Node's serialization of StateSet
+    }
+
     ADD_USER_SERIALIZER( InitialBound );  // _initialBound
     ADD_OBJECT_SERIALIZER( ComputeBoundingBoxCallback,
                            osg::Drawable::ComputeBoundingBoxCallback, NULL );  // _computeBoundCallback