diff --git a/doxygen.conf b/doxygen.conf
index 4ee4fbc..0340ad9 100644
--- a/doxygen.conf
+++ b/doxygen.conf
@@ -38,7 +38,7 @@ PROJECT_NAME           = "pyShelf Open Source Ebook Server"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.3.0
+PROJECT_NUMBER         = 0.4.0
 
 # 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 a