diff --git a/doc/doxyfile b/doc/doxyfile
index 924de51..e9a43a4 100644
--- a/doc/doxyfile
+++ b/doc/doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "n-Dimensional Fast Marching"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.5
+PROJECT_NUMBER         = 0.6
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a