diff --git a/configure.in b/configure.in
index 6a652b260..2d3d9f499 100644
--- a/configure.in
+++ b/configure.in
@@ -23,8 +23,8 @@ m4_define(glib_configure_in)
 #
 m4_define([glib_major_version], [2])
 m4_define([glib_minor_version], [21])
-m4_define([glib_micro_version], [5])
-m4_define([glib_interface_age], [0])
+m4_define([glib_micro_version], [6])
+4_define([glib_interface_age], [0])
 m4_define([glib_binary_age],
           [m4_eval(100 * glib_minor_version + glib_micro_version)])
 m4_define([glib_version],