diff --git a/configure.ac b/configure.ac
index 89d2a8b8..59f04032 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([netgen],[5.3.1],[],[])
+AC_INIT([netgen],[5.3-dev],[],[])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 
 AC_CONFIG_MACRO_DIR([m4])