diff --git a/configure.in b/configure.in
index c968f67389..db1a6d44fc 100644
--- a/configure.in
+++ b/configure.in
@@ -12,8 +12,8 @@ AC_PREREQ(2.54)
 
 m4_define([gtk_major_version], [2])
 m4_define([gtk_minor_version], [18])
-m4_define([gtk_micro_version], [4])
-m4_define([gtk_interface_age], [4])
+m4_define([gtk_micro_version], [5])
+m4_define([gtk_interface_age], [5])
 m4_define([gtk_binary_age],
           [m4_eval(100 * gtk_minor_version + gtk_micro_version)])
 m4_define([gtk_version],