diff --git a/docs/Doxyfile.developer b/docs/Doxyfile.developer
index 39716dcb6..347dee628 100644
--- a/docs/Doxyfile.developer
+++ b/docs/Doxyfile.developer
@@ -38,7 +38,7 @@ PROJECT_NAME           = netCDF-C
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 4.5.1-development
+PROJECT_NUMBER         = 4.6.1-development
 
 # 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