diff --git a/build/doxygen/dolibarr-doxygen.doxyfile b/build/doxygen/dolibarr-doxygen.doxyfile
index 409f376e01a..0b91506e862 100644
--- a/build/doxygen/dolibarr-doxygen.doxyfile
+++ b/build/doxygen/dolibarr-doxygen.doxyfile
@@ -31,7 +31,7 @@ PROJECT_NAME = dolibarr
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER = 3.0.0
+PROJECT_NUMBER = 3.1.0
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.