diff --git a/configure.in b/configure.in
index 3e67f6fd27..98ed021236 100644
--- a/configure.in
+++ b/configure.in
@@ -12,7 +12,7 @@ AC_PREREQ(2.62)
 
 m4_define([gtk_major_version], [2])
 m4_define([gtk_minor_version], [23])
-m4_define([gtk_micro_version], [90])
+m4_define([gtk_micro_version], [91])
 m4_define([gtk_interface_age], [0])
 m4_define([gtk_binary_age],
           [m4_eval(100 * gtk_minor_version + gtk_micro_version)])