diff --git a/ANNOUNCE b/ANNOUNCE
index e5d49d78..951aded3 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.23beta05 - October 25, 2007
+Libpng 1.2.23rc01 - November 2, 2007
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -9,32 +9,32 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.2.23beta05.tar.gz
-   libpng-1.2.23beta05.tar.bz2
+   libpng-1.2.23rc01.tar.gz
+   libpng-1.2.23rc01.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.23beta05-no-config.tar.gz
-   libpng-1.2.23beta05-no-config.tar.bz2
+   libpng-1.2.23rc01-no-config.tar.gz
+   libpng-1.2.23rc01-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1223b05.zip
-   lp1223b05.tar.bz2
+   lp1223r01.zip
+   lp1223r01.tar.bz2
 
 Project files
 
-   libpng-1.2.23beta05-project-netware.zip
-   libpng-1.2.23beta05-project-wince.zip
+   libpng-1.2.23rc01-project-netware.zip
+   libpng-1.2.23rc01-project-wince.zip
 
 Other information:
 
-   libpng-1.2.23beta05-README.txt
-   libpng-1.2.23beta05-KNOWNBUGS.txt
-   libpng-1.2.23beta05-LICENSE.txt
-   libpng-1.2.23beta05-Y2K-compliance.txt
+   libpng-1.2.23rc01-README.txt
+   libpng-1.2.23rc01-KNOWNBUGS.txt
+   libpng-1.2.23rc01-LICENSE.txt
+   libpng-1.2.23rc01-Y2K-compliance.txt
 
 Changes since the last public release (1.2.19):
 
@@ -62,7 +62,7 @@ version 1.2.20rc2 [August 27, 2007]
   Revised #ifdefs to ensure one and only one of pnggccrd.c, pngvcrd.c,
     or part of pngrutil.c is selected.
 
-version 1.2.20rc3 [October 25, 2007]
+version 1.2.20rc3 [November 2, 2007]
   Remove a little more code in pngwutil.c when PNG_NO_WRITE_FILTER is selected.
   Added /D _CRT_SECURE_NO_WARNINGS to visual6c and visualc71 projects.
   Compile png_mmx_support() in png.c even when PNG_NO_MMX_CODE is defined.
@@ -144,9 +144,12 @@ version 1.2.23beta03 [October 16, 2007]
 version 1.2.23beta04 [October 23, 2007]
   Reject attempt to set all-zero cHRM values.
 
-version 1.2.23beta05 [October 25, 2007]
+version 1.2.23beta05 [October 26]
   Add missing quotes in projects/visualc6, lost in version 1.2.20rc3
 
+version 1.2.23rc01 [November 2, 2007]
+  No changes.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 
 (subscription required; visit 
diff --git a/CHANGES b/CHANGES
index b2495c9c..255d976b 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2001,9 +2001,12 @@ version 1.2.23beta03 [October 16, 2007]
 version 1.2.23beta04 [October 23, 2007]
   Reject attempt to set all-zero cHRM values.
 
-version 1.2.23beta05 [October 25, 2007]
+version 1.2.23beta05 [October 26]
   Add missing quotes in projects/visualc6, lost in version 1.2.20rc3
 
+version 1.2.23rc01 [November 2, 2007]
+  No changes.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/INSTALL b/INSTALL
index e94ef9a7..fa8ea6e2 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.23beta05 - October 25, 2007
+Installing libpng version 1.2.23rc01 - November 2, 2007
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -44,7 +44,7 @@ to have access to the zlib.h and zconf.h include files that
 correspond to the version of zlib that's installed.
 
 You can rename the directories that you downloaded (they
-might be called "libpng-1.2.23beta05" or "lpng109" and "zlib-1.2.1"
+might be called "libpng-1.2.23rc01" or "lpng109" and "zlib-1.2.1"
 or "zlib121") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -101,9 +101,9 @@ include
  CMakeLists.txt    =>  "cmake" script
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.23beta05)
+                       gcc, creates libpng12.so.0.1.2.23rc01)
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.23beta05)
+                       (gcc, creates libpng12.so.0.1.2.23rc01)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -125,14 +125,14 @@ include
  makefile.openbsd  =>  OpenBSD makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.23beta05)
+                       creates libpng12.so.0.1.2.23rc01)
  makefile.sunos    =>  Sun makefile
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.23beta05)
+                       creates libpng12.so.0.1.2.23rc01)
  makefile.solaris-x86 =>  Solaris/intelMMX 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.23beta05)
+                       creates libpng12.so.0.1.2.23rc01)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.23beta05)
+                       creates libpng12.so.0.1.2.23rc01)
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
  makefile.64sunu   =>  Sun Ultra 64-bit makefile
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
diff --git a/KNOWNBUG b/KNOWNBUG
index a84c5b20..b8a3eca8 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.23beta05
+Known bugs in libpng version 1.2.23rc01
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
diff --git a/LICENSE b/LICENSE
index a8eb13e4..0b93cbb2 100644
--- a/LICENSE
+++ b/LICENSE
@@ -8,7 +8,7 @@ COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.23beta05, October 25, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.23rc01, November 2, 2007, are
 Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -106,4 +106,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 25, 2007
+November 2, 2007
diff --git a/README b/README
index eea69bc0..8632feed 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.23beta05 - October 25, 2007 (shared library 12.0)
+README for libpng version 1.2.23rc01 - November 2, 2007 (shared library 12.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -113,8 +113,8 @@ given in previous versions of this document.  He and Andreas will read mail
 addressed to the png-implement list, however.
 
 Please do not send general questions about PNG.  Send them to
-the (png-list at ccrc.wustl.edu, subscription required, write to
-majordomo at ccrc.wustl.edu with "subscribe png-list" in your message).
+the (png-mng-misc at lists.sourceforge.net, subscription required, visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement to subscribe)
 On the other hand,
 please do not send libpng questions to that address, send them to me
 or to the png-implement list.  I'll
@@ -125,7 +125,7 @@ and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for nine years now, and it is official and
+been discussing PNG for twelve years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used immediately,
 it may be used later.
@@ -190,11 +190,11 @@ Files in this distribution:
        descrip.mms      =>  VMS makefile for MMS or MMK
        makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
        makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng12.so.0.1.2.23beta05)
+                            gcc, creates libpng12.so.0.1.2.23rc01)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.23beta05)
+                            (gcc, creates libpng12.so.0.1.2.23rc01)
        makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.23beta05,
+                            (gcc, creates libpng12.so.0.1.2.23rc01,
                             uses assembler code tuned for Intel MMX platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
        makefile.knr     =>  Archaic UNIX Makefile that converts files with
@@ -216,12 +216,12 @@ Files in this distribution:
        makefile.openbsd =>  OpenBSD makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
        makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.23beta05)
+                            (gcc, creates libpng12.so.0.1.2.23rc01)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.23beta05)
+                            (gcc, creates libpng12.so.0.1.2.23rc01)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.23beta05)
+                            (gcc, creates libpng12.so.0.1.2.23rc01)
        makefile.32sunu  =>  Sun Ultra 32-bit makefile
        makefile.64sunu  =>  Sun Ultra 64-bit makefile
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
diff --git a/Y2KINFO b/Y2KINFO
index 46e6c208..80cb4164 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      October 25, 2007
+      November 2, 2007
 
       Since the PNG Development group is an ad-hoc body, we can't make
       an official declaration.
 
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.23beta05 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.23rc01 are Y2K compliant.  It is my belief that earlier
       versions were also Y2K compliant.
 
       Libpng only has three year fields.  One is a 2-byte unsigned integer
diff --git a/configure b/configure
index c511ea04..70790855 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.61 for libpng 1.2.23beta05.
+# Generated by GNU Autoconf 2.61 for libpng 1.2.23rc01.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -728,8 +728,8 @@ SHELL=${CONFIG_SHELL-/bin/sh}
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.2.23beta05'
-PACKAGE_STRING='libpng 1.2.23beta05'
+PACKAGE_VERSION='1.2.23rc01'
+PACKAGE_STRING='libpng 1.2.23rc01'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 
 ac_unique_file="pngget.c"
@@ -1405,7 +1405,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures libpng 1.2.23beta05 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.23rc01 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1475,7 +1475,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.2.23beta05:";;
+     short | recursive ) echo "Configuration of libpng 1.2.23rc01:";;
    esac
   cat <<\_ACEOF
 
@@ -1585,7 +1585,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.23beta05
+libpng configure 1.2.23rc01
 generated by GNU Autoconf 2.61
 
 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
@@ -1599,7 +1599,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.2.23beta05, which was
+It was created by libpng $as_me 1.2.23rc01, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   $ $0 $@
@@ -2269,7 +2269,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.2.23beta05'
+ VERSION='1.2.23rc01'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2440,7 +2440,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.2.23beta05
+PNGLIB_VERSION=1.2.23rc01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=23
@@ -21282,7 +21282,7 @@ exec 6>&1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.2.23beta05, which was
+This file was extended by libpng $as_me 1.2.23rc01, which was
 generated by GNU Autoconf 2.61.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -21335,7 +21335,7 @@ Report bugs to <bug-autoconf@gnu.org>."
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 ac_cs_version="\\
-libpng config.status 1.2.23beta05
+libpng config.status 1.2.23rc01
 configured by $0, generated by GNU Autoconf 2.61,
   with options \\"`echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`\\"
 
diff --git a/configure.ac b/configure.ac
index 9697099f..b916fa16 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.23beta05], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.23rc01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.23beta05
+PNGLIB_VERSION=1.2.23rc01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
 PNGLIB_RELEASE=23
diff --git a/libpng-1.2.23beta05.txt b/libpng-1.2.23rc01.txt
similarity index 99%
rename from libpng-1.2.23beta05.txt
rename to libpng-1.2.23rc01.txt
index 617e1083..e204f286 100644
--- a/libpng-1.2.23beta05.txt
+++ b/libpng-1.2.23rc01.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.23beta05 - October 25, 2007
+ libpng version 1.2.23rc01 - November 2, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -2796,13 +2796,13 @@ application:
 
 IX. Y2K Compliance in libpng
 
-October 25, 2007
+November 2, 2007
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.23beta05 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.23rc01 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
diff --git a/libpng.3 b/libpng.3
index 85bc1e56..ca4d9447 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "October 25, 2007"
+.TH LIBPNG 3 "November 2, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23beta05
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23rc01
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -410,7 +410,7 @@ Following is a copy of the libpng.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.23beta05 - October 25, 2007
+ libpng version 1.2.23rc01 - November 2, 2007
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2007 Glenn Randers-Pehrson
@@ -3206,13 +3206,13 @@ application:
 
 .SH IX. Y2K Compliance in libpng
 
-October 25, 2007
+November 2, 2007
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.2.23beta05 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.23rc01 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -3420,7 +3420,8 @@ the first widely used release:
  1.2.22rc1           13    10222  12.so.0.22[.0]
  1.0.30              10    10030  10.so.0.30[.0]
  1.2.22              13    10222  12.so.0.22[.0]
- 1.2.23beta01-04     13    10223  12.so.0.23[.0]
+ 1.2.23beta01-05     13    10223  12.so.0.23[.0]
+ 1.2.23rc01          13    10223  12.so.0.23[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3476,7 +3477,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.23beta05 - October 25, 2007:
+Libpng version 1.2.23rc01 - November 2, 2007:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -3497,7 +3498,7 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.23beta05, October 25, 2007, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.23rc01, November 2, 2007, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -3596,7 +3597,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 25, 2007
+November 2, 2007
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index cf59545d..a1191747 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "October 25, 2007"
+.TH LIBPNGPF 3 "November 2, 2007"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23beta05
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.23rc01
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 267ea52c..43742413 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "October 25, 2007"
+.TH PNG 5 "November 2, 2007"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index 7edc7aab..3308a527 100644
--- a/png.c
+++ b/png.c
@@ -13,7 +13,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_23beta05 Your_png_h_is_not_version_1_2_23beta05;
+typedef version_1_2_23rc01 Your_png_h_is_not_version_1_2_23rc01;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
@@ -693,7 +693,7 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    png_ptr = png_ptr;  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.23beta05 - October 25, 2007\n\
+   return ((png_charp) "\n libpng version 1.2.23rc01 - November 2, 2007\n\
    Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\
    Copyright (c) 1996-1997 Andreas Dilger\n\
    Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
diff --git a/png.h b/png.h
index 4432a2e0..e03f100e 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.23beta05 - October 25, 2007
+ * libpng version 1.2.23rc01 - November 2, 2007
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -9,7 +9,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.23beta05 - October 25, 2007: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.23rc01 - November 2, 2007: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -169,7 +169,8 @@
  *    1.2.22rc1               13    10222  12.so.0.22[.0]
  *    1.0.30                  10    10030  10.so.0.30[.0]
  *    1.2.22                  13    10222  12.so.0.22[.0]
- *    1.2.23beta01-04         13    10223  12.so.0.23[.0]
+ *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
+ *    1.2.23rc01              13    10223  12.so.0.23[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -199,7 +200,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.23beta05, October 25, 2007, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.23rc01, November 2, 2007, are
  * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -311,13 +312,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    October 25, 2007
+ *    November 2, 2007
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.23beta05 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.23rc01 are Y2K compliant.  It is my belief that earlier
  *    versions were also Y2K compliant.
  *
  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
@@ -373,9 +374,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.23beta05"
+#define PNG_LIBPNG_VER_STRING "1.2.23rc01"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.23beta05 - October 25, 2007\n"
+   " libpng version 1.2.23rc01 - November 2, 2007\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -387,7 +388,7 @@
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  05
+#define PNG_LIBPNG_VER_BUILD  01
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -404,7 +405,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_RC
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -1423,7 +1424,7 @@ struct png_struct_def
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef png_structp version_1_2_23beta05;
+typedef png_structp version_1_2_23rc01;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index 0584c41b..55421a00 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.23beta05 - October 25, 2007
+ * libpng version 1.2.23rc01 - November 2, 2007
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngerror.c b/pngerror.c
index cad4b9d1..ea696da5 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * Last changed in libpng 1.2.22 [October 25, 2007]
+ * Last changed in libpng 1.2.22 [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngpread.c b/pngpread.c
index 4e6135ca..559de5ae 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.2.22 [October 25, 2007]
+ * Last changed in libpng 1.2.22 [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngrtran.c b/pngrtran.c
index 4ae00f22..2a8ab32d 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.2.22 [October 25, 2007]
+ * Last changed in libpng 1.2.22 [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngrutil.c b/pngrutil.c
index 14717a9a..52a315e1 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.2.22 [October 25, 2007]
+ * Last changed in libpng 1.2.22 [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngset.c b/pngset.c
index e4f8efbd..86faa7c0 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.2.22 [October 25, 2007]
+ * Last changed in libpng 1.2.22 [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2007 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngtest.c b/pngtest.c
index 70c7042c..fa4a2ee9 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,7 +1,7 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * Last changed in libpng 1.2.22 - [October 25, 2007]
+ * Last changed in libpng 1.2.22 - [November 2, 2007]
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2004 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -1553,4 +1553,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_23beta05 your_png_h_is_not_version_1_2_23beta05;
+typedef version_1_2_23rc01 your_png_h_is_not_version_1_2_23rc01;
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 0ff778fb..353631a9 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -169,7 +169,7 @@ configure_file(${PNG_SOURCE_DIR}/scripts/libpng-config.in
 
 # SET UP LINKS
 set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#    VERSION 0.${PNGLIB_RELEASE}.1.2.23beta05
+#    VERSION 0.${PNGLIB_RELEASE}.1.2.23rc01
      VERSION 0.${PNGLIB_RELEASE}.0
      SOVERSION 0
      CLEAN_DIRECT_OUTPUT 1)
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 8d5262df..738c462b 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -8,7 +8,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.23beta05
+version=1.2.23rc01
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc-configure.in b/scripts/libpng.pc-configure.in
index 31acd65b..f5efb535 100644
--- a/scripts/libpng.pc-configure.in
+++ b/scripts/libpng.pc-configure.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng12
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.23beta05
+Version: 1.2.23rc01
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir} @LIBPNG_NO_MMX@
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 335bd0a0..9ed12039 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng12
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.2.23beta05
+Version: 1.2.23rc01
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index 860a8d0e..ede32f11 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 973aef08..d58d2f04 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index eeab878c..ea338c93 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -20,7 +20,7 @@ LN_SF = ln -f -s
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 1a44d91b..3b924f73 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 99870adf..3c6a5dd6 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -74,7 +74,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 674033c9..4110553c 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -19,7 +19,7 @@ ZLIBINC=../zlib
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 0b5ee41b..e3c3fcd8 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -5,7 +5,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 0cc9056b..03f9b9af 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index 04dc89e0..1731c822 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -14,7 +14,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index 36929be6..7452077d 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -18,7 +18,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index 3920dd4a..44aeeff3 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 0a7d54e8..f4d88488 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index b1a477a0..b41cb0d1 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 311f9a57..8742f05c 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -74,7 +74,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index ede82332..3f1b3eb3 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -14,7 +14,7 @@ INCSDIR=${LOCALBASE}/include/libpng12
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.23beta05
+SHLIB_MINOR=	1.2.23rc01
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index d6b46f9d..45fb0823 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -14,7 +14,7 @@ INCSDIR=${LOCALBASE}/include/libpng
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.23beta05
+SHLIB_MINOR=	1.2.23rc01
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
diff --git a/scripts/makefile.nommx b/scripts/makefile.nommx
index c6efdb93..f34a5d4a 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -7,7 +7,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index 539bd68d..e11aba21 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -8,7 +8,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.23beta05
+SHLIB_MINOR=	1.2.23rc01
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 24602a43..f7decfca 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 68dd2de9..43e800d6 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index a69c026e..954b9701 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -6,7 +6,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index 59c70658..48a71334 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 5753cea9..b711e900 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index 0e5c6253..49730401 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -8,7 +8,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.23beta05
+PNGMIN = 1.2.23rc01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index ee476948..5055405a 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.23beta05
+; Version 1.2.23rc01
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index ed0f6918..5abcb9bd 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.23beta05
+;Version 1.2.23rc01
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3