diff --git a/Doxyfile b/Doxyfile
index 2ecf956f5..07a715a3c 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -32,7 +32,7 @@ PROJECT_NAME           = gtsam
 # This could be handy for archiving the generated documentation or 
 # if some version control system is used.
 
-PROJECT_NUMBER         = 0.9.3
+PROJECT_NUMBER         = 1.9.0
 
 # 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