diff --git a/ANNOUNCE b/ANNOUNCE
index 9f3e677..179b601 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,41 +1,51 @@
 
-Libpng 1.5.5 - September 22, 2011
+Libpng 1.5.6beta01 - September 22, 2011
 
-This is a public release of libpng, intended for use in production codes.
+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.
 
 Files available for download:
 
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.5.5.tar.xz (LZMA-compressed, recommended)
-   libpng-1.5.5.tar.gz
-   libpng-1.5.5.tar.bz2
+   1.5.6beta01.tar.xz (LZMA-compressed, recommended)
+   1.5.6beta01.tar.gz
+   1.5.6beta01.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng155.7z  (LZMA-compressed, recommended)
-   lpng155.zip
+   lp156b01.7z  (LZMA-compressed, recommended)
+   lp156b01.zip
 
 Other information:
 
-   libpng-1.5.5-README.txt
-   libpng-1.5.5-LICENSE.txt
+   1.5.6beta01-README.txt
+   1.5.6beta01-LICENSE.txt
 
 Changes since the last public release (1.5.4):
 
+Version 1.5.5beta01 [July 13, 2011]
   Fixed some typos and made other minor changes in the manual.
   Updated contrib/pngminus/makefile.std (Samuli Souminen)
+
+Version 1.5.5beta02 [July 14, 2011]
   Revised Makefile.am and Makefile.in to look in the right directory for
     pnglibconf.h.prebuilt
+
+Version 1.5.5beta03 [July 27, 2011]
   Enabled compilation with g++ compiler.  This compiler does not recognize
     the file extension, so it always compiles with C++ rules.  Made minor
     changes to pngrutil.c to cast results where C++ expects it but C does not.
   Minor editing of libpng.3 and libpng-manual.txt.
+
+Version 1.5.5beta04 [July 29, 2011]
   Revised CMakeLists.txt (Clifford Yapp)
   Updated commentary about the png_rgb_to_gray() default coefficients
     in the manual and in pngrtran.c
+
+Version 1.5.5beta05 [August 17, 2011]
   Prevent unexpected API exports from non-libpng DLLs on Windows.  The "_DLL"
     is removed from the test of whether a DLL is being built (this erroneously
     caused the libpng APIs to be marked as DLL exports in static builds under
@@ -51,6 +61,8 @@
     configurations.)
   Added new types and internal functions for CIE RGB end point handling to
     pngpriv.h (functions yet to be implemented).
+
+Version 1.5.5beta06 [August 26, 2011]
   Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
     (Clifford Yap)
   Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
@@ -68,24 +80,32 @@
     the 8-bit non-gamma-corrected case (where consistency seems more important
     than correctness.)  The code still has considerable inaccuracies in the
     8-bit case because 8-bit linear arithmetic is used.
+
+Version 1.5.5beta07 [September 7, 2011]
   Added "$(ARCH)" option to makefile.darwin
   Added SunOS support to configure.ac and Makefile.am
   Changed png_chunk_benign_error() to png_warning() in png.c, in
     png_XYZ_from_xy_checked().
+
+Version 1.5.5beta08 [September 10, 2011]
   Fixed 64-bit compilation errors (gcc). The errors fixed relate
     to conditions where types that are 32 bits in the GCC 32-bit
     world (uLong and png_size_t) become 64 bits in the 64-bit
     world.  This produces potential truncation errors that the
     compiler correctly flags.
+  Relocated new HAVE_SOLARIS_LD definition in configure.ac
   Constant changes for 64-bit compatibility (removal of L suffixes). The
     16-bit cases still use "L" as we don't have a 16-bit test system.
 
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
+Version 1.5.5rc01 [September 17, 2011]
+  Removed "L" suffixes from constants in pngpriv.h
+
+Version 1.5.5 [September 22, 2011]
+  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
-to subscribe)
-or to glennrp at users.sourceforge.net
+to subscribe) or to glennrp at users.sourceforge.net
 
 Glenn R-P
-*/ }
-#endif
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 72e5269..4bcd794 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,7 @@
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
-set(PNGLIB_RELEASE 5)
+set(PNGLIB_RELEASE 6)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -262,7 +262,7 @@
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.5
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.6beta01
     VERSION 15.${PNGLIB_RELEASE}.0
     SOVERSION 15
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/LICENSE b/LICENSE
index 5e932e1..586268a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.5, September 22, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.6beta01, September 22, 2011, are
 Copyright (c) 2004, 2006-2011 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
diff --git a/README b/README
index a540e83..31398bd 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.5.5 - September 22, 2011 (shared library 15.0)
+README for libpng version 1.5.6beta01 - September 22, 2011 (shared library 15.0)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
diff --git a/configure b/configure
index d078444..e22b3fc 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.68 for libpng 1.5.5.
+# Generated by GNU Autoconf 2.68 for libpng 1.5.6beta01.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -570,8 +570,8 @@
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.5.5'
-PACKAGE_STRING='libpng 1.5.5'
+PACKAGE_VERSION='1.5.6beta01'
+PACKAGE_STRING='libpng 1.5.6beta01'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1308,7 +1308,7 @@
   # 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 1.5.5 to adapt to many kinds of systems.
+\`configure' configures libpng 1.5.6beta01 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1378,7 +1378,7 @@
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.5.5:";;
+     short | recursive ) echo "Configuration of libpng 1.5.6beta01:";;
    esac
   cat <<\_ACEOF
 
@@ -1486,7 +1486,7 @@
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.5.5
+libpng configure 1.5.6beta01
 generated by GNU Autoconf 2.68
 
 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -1909,7 +1909,7 @@
 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 1.5.5, which was
+It was created by libpng $as_me 1.5.6beta01, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   $ $0 $@
@@ -2724,7 +2724,7 @@
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.5.5'
+ VERSION='1.5.6beta01'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2788,10 +2788,10 @@
 
 
 
-PNGLIB_VERSION=1.5.5
+PNGLIB_VERSION=1.5.6beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=5
+PNGLIB_RELEASE=6
 
 
 
@@ -13073,7 +13073,7 @@
 # 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 1.5.5, which was
+This file was extended by libpng $as_me 1.5.6beta01, which was
 generated by GNU Autoconf 2.68.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -13139,7 +13139,7 @@
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.5.5
+libpng config.status 1.5.6beta01
 configured by $0, generated by GNU Autoconf 2.68,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 18f62c1..3a93763 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.5.5], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.6beta01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.5.5
+PNGLIB_VERSION=1.5.6beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=5
+PNGLIB_RELEASE=6
 
 dnl End of version number stuff
 
diff --git a/libpng-manual.txt b/libpng-manual.txt
index eb6bacb..b17753f 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.5 - September 22, 2011
+ libpng version 1.5.6beta01 - September 22, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.5 - September 22, 2011
+ libpng versions 0.97, January 1998, through 1.5.6beta01 - September 22, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -4566,7 +4566,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.5 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.6beta01 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 571be91..c9ad0dd 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
 .TH LIBPNG 3 "September 22, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.5
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.6beta01
 .SH SYNOPSIS
 \fI\fB
 
@@ -977,7 +977,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.5.5 - September 22, 2011
+ libpng version 1.5.6beta01 - September 22, 2011
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -988,7 +988,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.5.5 - September 22, 2011
+ libpng versions 0.97, January 1998, through 1.5.6beta01 - September 22, 2011
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2011 Glenn Randers-Pehrson
 
@@ -5544,7 +5544,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.5 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.6beta01 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
@@ -5799,7 +5799,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.5.5 - September 22, 2011:
+Libpng version 1.5.6beta01 - September 22, 2011:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -5822,7 +5822,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.5.5, September 22, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.6beta01, September 22, 2011, 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
diff --git a/libpngpf.3 b/libpngpf.3
index b1bce64..68f3b4f 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
 .TH LIBPNGPF 3 "September 22, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.5
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.6beta01
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"
diff --git a/png.c b/png.c
index c521ad2..6d073c6 100644
--- a/png.c
+++ b/png.c
@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
@@ -14,7 +14,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_5 Your_png_h_is_not_version_1_5_5;
+typedef png_libpng_version_1_5_6beta01 Your_png_h_is_not_version_1_5_6beta01;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -645,13 +645,13 @@
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.5.5 - September 22, 2011" PNG_STRING_NEWLINE \
+     "libpng version 1.5.6beta01 - September 22, 2011" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.5.5 - September 22, 2011\
+      return "libpng version 1.5.6beta01 - September 22, 2011\
       Copyright (c) 1998-2011 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
diff --git a/png.h b/png.h
index 7c8a9c2..bb551d6 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.5.5 - September 22, 2011
+ * libpng version 1.5.6beta01 - September 22, 2011
  * Copyright (c) 1998-2011 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.)
@@ -11,7 +11,7 @@
  * 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 1.5.5 - September 22, 2011: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.6beta01 - September 22, 2011: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -191,7 +191,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.5, September 22, 2011, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.6beta01, September 22, 2011, are
  * Copyright (c) 2004, 2006-2011 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:
@@ -309,7 +309,7 @@
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.5.5 are Y2K compliant.  It is my belief that
+ *    upward through 1.5.6beta01 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -364,9 +364,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.5.5"
+#define PNG_LIBPNG_VER_STRING "1.5.6beta01"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.5 - September 22, 2011\n"
+     " libpng version 1.5.6beta01 - September 22, 2011\n"
 
 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -374,12 +374,12 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   5
-#define PNG_LIBPNG_VER_RELEASE 5
+#define PNG_LIBPNG_VER_RELEASE 6
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  0
+#define PNG_LIBPNG_VER_BUILD  01
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -404,7 +404,7 @@
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
  */
-#define PNG_LIBPNG_VER 10505 /* 1.5.5 */
+#define PNG_LIBPNG_VER 10506 /* 1.5.6 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -526,7 +526,7 @@
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_5_5;
+typedef char* png_libpng_version_1_5_6beta01;
 
 /* Three color definitions.  The order of the red, green, and blue, (and the
  * exact size) is not important, although the size of the fields need to
diff --git a/pngconf.h b/pngconf.h
index 05dd292..851a6e5 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.5 - September 22, 2011
+ * libpng version 1.5.6beta01 - September 22, 2011
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngget.c b/pngget.c
index 3c1b409..770c123 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1,7 +1,7 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
diff --git a/pngpriv.h b/pngpriv.h
index dad2837..8ca5d1a 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -6,7 +6,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
diff --git a/pngrtran.c b/pngrtran.c
index f884790..c6dd288 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 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
diff --git a/pngrutil.c b/pngrutil.c
index bfff7d6..a74353d 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
diff --git a/pngset.c b/pngset.c
index 7bae97c..373d21b 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
diff --git a/pngstruct.h b/pngstruct.h
index a9155b4..b4e5f3b 100644
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -5,7 +5,7 @@
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
diff --git a/pngtest.c b/pngtest.c
index 4bb24f3..9c4615d 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1794,4 +1794,4 @@
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_5 Your_png_h_is_not_version_1_5_5;
+typedef png_libpng_version_1_5_6beta01 Your_png_h_is_not_version_1_5_6beta01;
diff --git a/pngvalid.c b/pngvalid.c
index a3626b2..9d1ce79 100644
--- a/pngvalid.c
+++ b/pngvalid.c
@@ -1,7 +1,7 @@
 
 /* pngvalid.c - validate libpng by constructing then reading png files.
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 2011 Glenn Randers-Pehrson
  * Written by John Cunningham Bowler
  *
diff --git a/pngwutil.c b/pngwutil.c
index bc3e4dd..bafa406 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,7 +1,7 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * Last changed in libpng 1.5.5 [September 22, 2011]
+ * Last changed in libpng 1.5.5 [(PENDING RELEASE)]
  * Copyright (c) 1998-2011 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.)
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index e1a726b..1e2a261 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.5.5 - September 22, 2011
+libpng version 1.5.6beta01 - September 22, 2011
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index 31ddabf..10d9442 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.5.5 - September 22, 2011
+ * libpng version 1.5.6beta01 - September 22, 2011
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index a53f152..a0a309b 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,9 +1,9 @@
 
-Makefiles for  libpng version 1.5.5 - September 22, 2011
+Makefiles for  libpng version 1.5.6beta01 - September 22, 2011
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.5)
+                       (gcc, creates libpng15.so.15.1.5.6beta01)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       (gcc, creates libpng15.so.15.1.5.5)
+                       (gcc, creates libpng15.so.15.1.5.6beta01)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires libpng.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng15.so.15.1.5.5)
+                       creates libpng15.so.15.1.5.6beta01)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.5)
+                       creates libpng15.so.15.1.5.6beta01)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.5)
+                       creates libpng15.so.15.1.5.6beta01)
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
  makefile.sunos    =>  Sun makefile
  makefile.32sunu   =>  Sun Ultra 32-bit makefile
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 4694f6b..b38d6f4 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.5.5
+version=1.5.6beta01
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index ec8f82d..b36ddce 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.5.5
+Version: 1.5.6beta01
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}
diff --git a/scripts/makefile.cegcc b/scripts/makefile.cegcc
index ebf6c6d..f73929b 100644
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -23,7 +23,7 @@
 
 VERMAJ = 1
 VERMIN = 5
-VERMIC = 5
+VERMIC = 6
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index df8a59d..9bea401 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng15
 PNGMAJ = 15
-RELEASE = 5
+RELEASE = 6
 
 # Shared library names:
 LIBSO=$(LIBNAME).so
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index d6ed321..bc04bcc 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@
 
 LIB=	png15
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.5
+SHLIB_MINOR=	1.5.6beta01
 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 45c821b..7c84ecb 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.5
+SHLIB_MINOR=	1.5.6beta01
 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.openbsd b/scripts/makefile.openbsd
index 9c12d60..1c67228 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.5
+SHLIB_MINOR=	1.5.6beta01
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/symbols.def b/scripts/symbols.def
index 3d0e1e7..8809de1 100644
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.5.5
+;Version 1.5.6beta01
  png_access_version_number @1
  png_set_sig_bytes @2
  png_sig_cmp @3