diff --git a/NEWS b/NEWS
index a9becc926..520df7a95 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,14 @@
+Overview of changes in GLib 2.66.6
+==================================
+
+* Fix various instances within GLib where `g_memdup()` was vulnerable to a
+  silent integer truncation and heap overflow problem (discovered by
+  Kevin Backhouse, work by Philip Withnall) (#2319)
+
+* Bugs fixed:
+ - !1927 Backport !1926 “Add g_memdup2()” to glib-2-66
+
+
 Overview of changes in GLib 2.66.5
 ==================================
 
diff --git a/meson.build b/meson.build
index f33421980..ac9f739d3 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('glib', 'c', 'cpp',
-  version : '2.66.5',
+  version : '2.66.6',
   # NOTE: We keep this pinned at 0.49 because that's what Debian 10 ships
   meson_version : '>= 0.49.2',
   default_options : [