diff --git a/NEWS b/NEWS
index d2b586c4d..afe6a56ed 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,23 @@
+Overview of changes in GLib 2.51.3
+==================================
+
+* Bugs fixed:
+ 771997 gchecksum: Add SHA-384 support
+ 778422 gsubprocesslauncher: Clarify the behavior of set_environ()
+ 778581 gdbus-codegen: Fix -Wconversion warning
+ 778801 gdbus-codegen: Add --outdir flag
+ 778991 Plug a mem leak in gdbusauth
+ 779183 g_io_extension_point_get_extensions should check for NULL pointer
+
+* Translation updates:
+ Basque
+ Chinese (Taiwan)
+ Danish
+ Indonesian
+ Italian
+ Serbian
+
+
 Overview of changes in GLib 2.51.2
 ==================================
 
diff --git a/configure.ac b/configure.ac
index edb8e760e..954d86e9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@ m4_define(glib_configure_ac)
 
 m4_define([glib_major_version], [2])
 m4_define([glib_minor_version], [51])
-m4_define([glib_micro_version], [2])
+m4_define([glib_micro_version], [3])
 m4_define([glib_interface_age], [0])
 m4_define([glib_binary_age],
           [m4_eval(100 * glib_minor_version + glib_micro_version)])