diff --git a/ChangeLog b/ChangeLog
index abd4637..6534a64 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,9 +1,10 @@
-2012-10-xx Keith Winstein <mosh-devel@mit.edu>
+2012-10-19 Keith Winstein <mosh-devel@mit.edu>
 
 	* Version 1.2.3 released.
 
 	* Security improvements:
 		* Use OpenSSL AES implementation
+		* Update AES-OCB implementation (Keegan McAllister)
 		* Don't let bad server dictate IP (Felix Groebert)
 
 	* New features:
@@ -18,6 +19,7 @@
 	* Bug fixes:
 		* Improved performance on systems with expensive time
 		* No longer choke on "ffff::" address for hosts with IPv6
+		* More conservative MTU and datagram sizing
 
 	* Platform support:
 		* Build on Solaris and IllumOS (Timo Sirainen, Ira Cooper)
diff --git a/configure.ac b/configure.ac
index cbcb62d..c5f167c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.61])
-AC_INIT([mosh], [1.2.2.95rc1], [mosh-devel@mit.edu])
+AC_INIT([mosh], [1.2.3], [mosh-devel@mit.edu])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AC_CONFIG_SRCDIR([src/frontend/mosh-client.cc])
diff --git a/debian/changelog b/debian/changelog
index d07b7b6..c4068b0 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,13 @@
+mosh (1.2.3-1) unstable; urgency=low
+
+  * Version 1.2.3 released.
+
+  * Update AES-OCB implementation (Keegan McAllister)
+
+  * More conservative MTU and datagram sizing
+
+ -- Keith Winstein <keithw@mit.edu>  Fri, 19 Oct 2012 15:21:54 -0400
+
 mosh (1.2.2.95rc1-1) unstable; urgency=low
 
   * Security improvements:
diff --git a/fedora/mosh.spec b/fedora/mosh.spec
index 0543c2a..4dedb74 100644
--- a/fedora/mosh.spec
+++ b/fedora/mosh.spec
@@ -1,5 +1,5 @@
 Name:		mosh
-Version:	1.2
+Version:	1.2.3
 Release:	2%{?dist}
 Summary:	Mobile shell that supports roaming and intelligent local echo
 
@@ -50,6 +50,9 @@ make install DESTDIR=$RPM_BUILD_ROOT
 
 
 %changelog
+* Fri Oct 19 2012 Keith Winstein <mosh-devel@mit.edu> - 1.2.3-1
+- Update to mosh 1.2.3.
+
 * Sat Apr 28 2012 Alexander Chernyakhovsky <achernya@mit.edu> - 1.2-2
 - Add -g and -O2 CFLAGS
 
diff --git a/scripts/mosh b/scripts/mosh
index 3838ba1..a6d6584 100755
--- a/scripts/mosh
+++ b/scripts/mosh
@@ -30,7 +30,7 @@
 #   this exception statement from all source files in the program, then
 #   also delete it here.
 
-my $MOSH_VERSION = '1.2.2.95rc1';
+my $MOSH_VERSION = '1.2.3';
 
 use warnings;
 use strict;