diff --git a/ANNOUNCE b/ANNOUNCE
index f7d49359..df6d0c05 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,65 +1,49 @@
 
-Libpng 1.2.51 - February 6, 2014
+Libpng 1.2.52beta01 - February 6, 2014
 
-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-1.2.51.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.51.tar.gz
-   libpng-1.2.51.tar.bz2
+   libpng-1.2.52beta01.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.52beta01.tar.gz
+   libpng-1.2.52beta01.tar.bz2
 
 Source files with LF line endings (for Unix/Linux) without the
 "configure" script
 
-   libpng-1.2.51-no-config.tar.xz (LZMA-compressed, recommended)
-   libpng-1.2.51-no-config.tar.gz
-   libpng-1.2.51-no-config.tar.bz2
+   libpng-1.2.52beta01-no-config.tar.xz (LZMA-compressed, recommended)
+   libpng-1.2.52beta01-no-config.tar.gz
+   libpng-1.2.52beta01-no-config.tar.bz2
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng1251.zip
-   lpng1251.7z
-   lpng1251.tar.bz2
+   lp1252b01.zip
+   lp1252b01.7z
+   lp1252b01.tar.bz2
 
 Project files
 
-   libpng-1.2.51-project-netware.zip
-   libpng-1.2.51-project-wince.zip
+   libpng-1.2.52beta01-project-netware.zip
+   libpng-1.2.52beta01-project-wince.zip
 
 Other information:
 
-   libpng-1.2.51-README.txt
-   libpng-1.2.51-KNOWNBUGS.txt
-   libpng-1.2.51-LICENSE.txt
-   libpng-1.2.51-Y2K-compliance.txt
-   libpng-1.2.51-[previous version]-diff.txt
+   libpng-1.2.52beta01-README.txt
+   libpng-1.2.52beta01-KNOWNBUGS.txt
+   libpng-1.2.52beta01-LICENSE.txt
+   libpng-1.2.52beta01-Y2K-compliance.txt
+   libpng-1.2.52beta01-[previous version]-diff.txt
+   libpng-1.2.52beta01-*.asc (armored detached GPG signatures)
 
-Changes since the last public release (1.2.50):
+Changes since the last public release (1.2.51):
 
-version 1.2.51 [February 6, 2014]
-
-version 1.0.61 and 1.2.51 [February 6, 2014]
-  Ignore, with a warning, out-of-range value of num_trans in png_set_tRNS().
-  Replaced AM_CONFIG_HEADER(config.h) with AC_CONFIG_HEADERS([config.h])
-    in configure.ac
-  Changed default value of PNG_USER_CACHE_MAX from 0 to 32767 in pngconf.h.
-  Avoid a possible memory leak in contrib/gregbook/readpng.c
-  Revised libpng.3 so that "doclifter" can process it.
-  Changed '"%s"m' to '"%s" m' in png_debug macros to improve portability
-    among compilers.
-  Rebuilt the configure scripts with autoconf-2.69 and automake-1.14.1
-  Removed potentially misleading warning from png_check_IHDR().
-  Quiet set-but-not-used warnings in pngset.c
-  Quiet an uninitialized memory warning from VC2013 in png_get_png().
-  Quiet unused variable warnings from clang by porting PNG_UNUSED() from
-    libpng-1.4.6.
-  Added -DZ_SOLO to CFLAGS in contrib/pngminim/*/makefile
-  Added an #ifdef PNG_FIXED_POINT_SUPPORTED/#endif in pngset.c
+version 1.2.52beta01 [February 6, 2014]
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 7bd5e630..8c8d0614 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2814,6 +2814,8 @@ version 1.2.51rc04 [February 3, 2014]
 version 1.0.61 and 1.2.51 [February 6, 2014]
   Added an #ifdef PNG_FIXED_POINT_SUPPORTED/#endif in pngset.c
 
+version 1.2.52beta01 [February 6, 2014]
+
 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/CMakeLists.txt b/CMakeLists.txt
index c7976a03..450d332b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ enable_testing()
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 2)
-set(PNGLIB_RELEASE 51)
+set(PNGLIB_RELEASE 52)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -215,7 +215,7 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/libpng-config.in
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 0.${PNGLIB_RELEASE}.1.2.51
+#   VERSION 0.${PNGLIB_RELEASE}.1.2.52beta01
     VERSION 0.${PNGLIB_RELEASE}.0
     SOVERSION 0
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/INSTALL b/INSTALL
index 8bc08a8a..324eaf93 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.2.51 - February 6, 2014
+Installing libpng version 1.2.52beta01 - February 6, 2014
 
 On Unix/Linux and similar systems, you can simply type
 
@@ -46,7 +46,7 @@ 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-1.2.51" or "libpng12" and "zlib-1.2.3"
+might be called "libpng-1.2.52beta01" or "libpng12" and "zlib-1.2.3"
 or "zlib123") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
diff --git a/KNOWNBUG b/KNOWNBUG
index f63e3cb7..9a659f4c 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,5 +1,5 @@
 
-Known bugs in libpng version 1.2.51
+Known bugs in libpng version 1.2.52beta01
 
 1. February 23, 2006: The custom makefiles don't build libpng with -lz.
 
diff --git a/LICENSE b/LICENSE
index b7364180..33059483 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.51, February 6, 2014, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.52beta01, February 6, 2014, are
 Copyright (c) 2004, 2006-2014 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/Makefile.am b/Makefile.am
index 3d8780f7..6d8a277f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -89,7 +89,7 @@ EXTRA_DIST= \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.51.txt pnggccrd.c pngvcrd.c
+	example.c libpng-1.2.52beta01.txt pnggccrd.c pngvcrd.c
 
 CLEANFILES= pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
diff --git a/Makefile.in b/Makefile.in
index 71be1dd0..7d9ce848 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -637,7 +637,7 @@ EXTRA_DIST = \
 	${srcdir}/contrib/pngsuite/* \
 	${srcdir}/contrib/visupng/* \
 	$(TESTS) \
-	example.c libpng-1.2.51.txt pnggccrd.c pngvcrd.c
+	example.c libpng-1.2.52beta01.txt pnggccrd.c pngvcrd.c
 
 CLEANFILES = pngout.png libpng12.pc libpng12-config libpng.vers \
 libpng.sym
diff --git a/README b/README
index 20e1fda7..f34c74a8 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.2.51 - February 6, 2014 (shared library 12.0)
+README for libpng version 1.2.52beta01 - February 6, 2014 (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.
@@ -201,11 +201,11 @@ Files in this distribution:
        makefile.std     =>  Generic UNIX makefile (cc, creates static
                             libpng.a)
        makefile.elf     =>  Linux/ELF gcc makefile symbol versioning,
-                            creates libpng12.so.0.1.2.51)
+                            creates libpng12.so.0.1.2.52beta01)
        makefile.linux   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.51)
+                            libpng12.so.0.1.2.52beta01)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng12.so.0.1.2.51, previously
+                            libpng12.so.0.1.2.52beta01, previously
                             used assembler code tuned for Intel MMX
                             platform)
        makefile.gcc     =>  Generic makefile (gcc, creates static
@@ -230,12 +230,12 @@ 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.0.1.2.51)
+                            (gcc, creates libpng12.so.0.1.2.52beta01)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.51)
+                            (gcc, creates libpng12.so.0.1.2.52beta01)
        makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.51)
+                            (gcc, creates libpng12.so.0.1.2.52beta01)
        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 1bbe7123..91cffd0f 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -7,7 +7,7 @@
       an official declaration.
 
       This is your unofficial assurance that libpng from version 0.71 and
-      upward through 1.2.51 are Y2K compliant.  It is my belief that earlier
+      upward through 1.2.52beta01 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 085ed783..37b33128 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for libpng 1.2.51.
+# Generated by GNU Autoconf 2.69 for libpng 1.2.52beta01.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -590,8 +590,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.2.51'
-PACKAGE_STRING='libpng 1.2.51'
+PACKAGE_VERSION='1.2.52beta01'
+PACKAGE_STRING='libpng 1.2.52beta01'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1331,7 +1331,7 @@ 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 1.2.51 to adapt to many kinds of systems.
+\`configure' configures libpng 1.2.52beta01 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1401,7 +1401,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.2.51:";;
+     short | recursive ) echo "Configuration of libpng 1.2.52beta01:";;
    esac
   cat <<\_ACEOF
 
@@ -1515,7 +1515,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.2.51
+libpng configure 1.2.52beta01
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1938,7 +1938,7 @@ 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 1.2.51, which was
+It was created by libpng $as_me 1.2.52beta01, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2801,7 +2801,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.2.51'
+ VERSION='1.2.52beta01'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2917,10 +2917,10 @@ fi
 
 
 
-PNGLIB_VERSION=1.2.51
+PNGLIB_VERSION=1.2.52beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
-PNGLIB_RELEASE=51
+PNGLIB_RELEASE=52
 
 
 
@@ -13123,7 +13123,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=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 1.2.51, which was
+This file was extended by libpng $as_me 1.2.52beta01, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -13189,7 +13189,7 @@ _ACEOF
 cat >>$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 1.2.51
+libpng config.status 1.2.52beta01
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 1dc7e6d9..eab433a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)
 
 dnl Version number stuff here:
 
-AC_INIT([libpng], [1.2.51], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.2.52beta01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE
 
-PNGLIB_VERSION=1.2.51
+PNGLIB_VERSION=1.2.52beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=2
-PNGLIB_RELEASE=51
+PNGLIB_RELEASE=52
 
 dnl End of version number stuff
 
diff --git a/libpng-1.2.51.txt b/libpng-1.2.52beta01.txt
similarity index 99%
rename from libpng-1.2.51.txt
rename to libpng-1.2.52beta01.txt
index 98f50706..6857d4f7 100644
--- a/libpng-1.2.51.txt
+++ b/libpng-1.2.52beta01.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.2.51 - February 6, 2014
+ libpng version 1.2.52beta01 - February 6, 2014
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.51 - February 6, 2014
+ libpng versions 0.97, January 1998, through 1.2.52beta01 - February 6, 2014
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
 
@@ -878,7 +878,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.51, not all possible expansions are supported.
+As of libpng version 1.2.52beta01, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3188,7 +3188,7 @@ 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 1.2.51 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.52beta01 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 29a54aee..39b8d8dc 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
 .TH LIBPNG 3 "February 6, 2014"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.51
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.52beta01
 .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 1.2.51 - February 6, 2014
+ libpng version 1.2.52beta01 - February 6, 2014
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
@@ -421,7 +421,7 @@ libpng.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.2.51 - February 6, 2014
+ libpng versions 0.97, January 1998, through 1.2.52beta01 - February 6, 2014
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2014 Glenn Randers-Pehrson
 
@@ -1288,7 +1288,7 @@ things.
 As of libpng version 1.2.9, png_set_expand_gray_1_2_4_to_8() was
 added.  It expands the sample depth without changing tRNS to alpha.
 
-As of libpng version 1.2.51, not all possible expansions are supported.
+As of libpng version 1.2.52beta01, not all possible expansions are supported.
 
 In the following table, the 01 means grayscale with depth<8, 31 means
 indexed with depth<8, other numerals represent the color type, "T" means
@@ -3598,7 +3598,7 @@ 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 1.2.51 are Y2K compliant.  It is my belief that earlier
+upward through 1.2.52beta01 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
@@ -3925,6 +3925,7 @@ the first widely used release:
  1.2.51rc01-04       13    10251  12.so.0.51[.0]
  1.0.61              10    10061  10.so.0.61[.0]
  1.2.51              13    10251  12.so.0.51[.0]
+ 1.2.52beta01        13    10252  12.so.0.52[.0]
 
 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -3980,7 +3981,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.2.51 - February 6, 2014:
+Libpng version 1.2.52beta01 - February 6, 2014:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -4003,7 +4004,7 @@ this sentence.
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.51, February 6, 2014, are
+libpng versions 1.2.6, August 15, 2004, through 1.2.52beta01, February 6, 2014, are
 Copyright (c) 2004,2006-2008 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 37c5d646..368ee8f2 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
 .TH LIBPNGPF 3 "February 6, 2014"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.2.51
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.52beta01
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.c b/png.c
index 6fb497b4..177d0feb 100644
--- a/png.c
+++ b/png.c
@@ -17,7 +17,7 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_51 Your_png_h_is_not_version_1_2_51;
+typedef version_1_2_52beta01 Your_png_h_is_not_version_1_2_52beta01;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.
@@ -724,13 +724,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #ifdef __STDC__
    return ((png_charp) PNG_STRING_NEWLINE \
-     "libpng version 1.2.51 - February 6, 2014" PNG_STRING_NEWLINE \
+     "libpng version 1.2.52beta01 - February 6, 2014" PNG_STRING_NEWLINE \
      "Copyright (c) 1998-2014 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 ((png_charp) "libpng version 1.2.51 - February 6, 2014\
+      return ((png_charp) "libpng version 1.2.52beta01 - February 6, 2014\
       Copyright (c) 1998-2014 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 1c5ce845..01c7fa06 100644
--- a/png.h
+++ b/png.h
@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.51 - February 6, 2014
+ * libpng version 1.2.52beta01 - February 6, 2014
  * Copyright (c) 1998-2014 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.)
@@ -10,7 +10,7 @@
  * 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 1.2.51 - February 6, 2014: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.52beta01 - February 6, 2014: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -288,6 +288,7 @@
  *    1.2.51rc01-04           13    10251  12.so.0.51[.0]
  *    1.0.61                  10    10061  10.so.0.61[.0]
  *    1.2.51                  13    10251  12.so.0.51[.0]
+ *    1.2.52beta01            13    10252  12.so.0.52[.0]
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -319,7 +320,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.51, February 6, 2014, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.52beta01, February 6, 2014, are
  * Copyright (c) 2004, 2006-2013 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:
@@ -437,7 +438,7 @@
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.2.51 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.2.52beta01 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
@@ -493,9 +494,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.51"
+#define PNG_LIBPNG_VER_STRING "1.2.52beta01"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.51 - February 6, 2014\n"
+   " libpng version 1.2.52beta01 - February 6, 2014\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -503,12 +504,12 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 51
+#define PNG_LIBPNG_VER_RELEASE 52
 /* 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
@@ -525,7 +526,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
@@ -533,7 +534,7 @@
  * 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 10251 /* 1.2.51 */
+#define PNG_LIBPNG_VER 10252 /* 1.2.52 */
 
 #ifndef PNG_VERSION_INFO_ONLY
 /* Include the compression library's header */
@@ -1573,7 +1574,7 @@ 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_51;
+typedef png_structp version_1_2_52beta01;
 
 typedef png_struct FAR * FAR * png_structpp;
 
diff --git a/pngconf.h b/pngconf.h
index de6e8e29..720ab641 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.51 - February 6, 2014
+ * libpng version 1.2.52beta01 - February 6, 2014
  * Copyright (c) 1998-2013 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/pngtest.c b/pngtest.c
index 7ce2ee61..275271b0 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1702,4 +1702,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_51 your_png_h_is_not_version_1_2_51;
+typedef version_1_2_52beta01 your_png_h_is_not_version_1_2_52beta01;
diff --git a/projects/wince.txt b/projects/wince.txt
index cab64071..f307c041 100644
--- a/projects/wince.txt
+++ b/projects/wince.txt
@@ -1,6 +1,6 @@
 A set of project files is available for WinCE.  Get
-libpng-1.2.51-project-wince.zip from a libpng distribution
+libpng-1.2.52beta01-project-wince.zip from a libpng distribution
 site such as http://libpng.sourceforge.net/index.html
 
 Put the zip file in this directory (projects) and then run
-"unzip -a libpng-1.2.51-project-wince.zip"
+"unzip -a libpng-1.2.52beta01-project-wince.zip"
diff --git a/projects/xcode/libpng.xcodeproj/project.pbxproj b/projects/xcode/libpng.xcodeproj/project.pbxproj
index ecff0bbf..3577fa40 100644
--- a/projects/xcode/libpng.xcodeproj/project.pbxproj
+++ b/projects/xcode/libpng.xcodeproj/project.pbxproj
@@ -222,7 +222,7 @@
 				COPY_PHASE_STRIP = NO;
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.51;
+				FRAMEWORK_VERSION = 1.2.52beta01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
@@ -240,7 +240,7 @@
 			buildSettings = {
 				DYLIB_COMPATIBILITY_VERSION = 3;
 				DYLIB_CURRENT_VERSION = 3;
-				FRAMEWORK_VERSION = 1.2.51;
+				FRAMEWORK_VERSION = 1.2.52beta01;
 				GCC_PRECOMPILE_PREFIX_HEADER = NO;
 				GCC_PREFIX_HEADER = "";
 				INFOPLIST_FILE = Info.plist;
diff --git a/scripts/README.txt b/scripts/README.txt
index 6411db86..401ec256 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,8 +1,8 @@
 
-Makefiles for  libpng version 1.2.51 - February 6, 2014
+Makefiles for  libpng version 1.2.52beta01 - February 6, 2014
 
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng12.so.0.1.2.51)
+                       (gcc, creates libpng12.so.0.1.2.52beta01)
  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 @@ Makefiles for  libpng version 1.2.51 - February 6, 2014
  makefile.dec      =>  DEC Alpha UNIX makefile
  makefile.dj2      =>  DJGPP 2 makefile
  makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       gcc, creates libpng12.so.0.1.2.51)
+                       gcc, creates libpng12.so.0.1.2.52beta01)
  makefile.freebsd  =>  FreeBSD makefile
  makefile.gcc      =>  Generic gcc makefile
  makefile.gccmmx   =>  Generic gcc makefile previously using MMX code
@@ -38,14 +38,14 @@ Makefiles for  libpng version 1.2.51 - February 6, 2014
  makefile.os2      =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng12.so.0.1.2.51)
+                       creates libpng12.so.0.1.2.52beta01)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng12.so.0.1.2.51)
+                       creates libpng12.so.0.1.2.52beta01)
  makefile.solaris-x86  =>  Solaris 2.X makefile (gcc, no MMX code,
-                       creates libpng12.so.0.1.2.51)
+                       creates libpng12.so.0.1.2.52beta01)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng12.so.0.1.2.51)
+                       creates libpng12.so.0.1.2.52beta01)
  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 5d19b0c1..f37cb8d4 100755
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.2.51
+version=1.2.52beta01
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 7a5eb1cc..74586d69 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: 1.2.51
+Version: 1.2.52beta01
 Libs: -L${libdir} -lpng12
 Cflags: -I${includedir}
diff --git a/scripts/makefile.32sunu b/scripts/makefile.32sunu
index e25d7c1b..c21729b1 100644
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.64sunu b/scripts/makefile.64sunu
index 7b96647a..9faa3f5b 100644
--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index 131c2efb..eccc56cc 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -23,7 +23,7 @@ LN_SF = ln -f -s
 
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 1f0a32ff..30768a13 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.cegcc b/scripts/makefile.cegcc
index 775e8e88..153846f9 100644
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -23,7 +23,7 @@
 
 VERMAJ = 1
 VERMIN = 2
-VERMIC = 51
+VERMIC = 52
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index 15e8e616..512c9993 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -77,7 +77,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 CYGDLL = 12
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(CYGDLL).dll
diff --git a/scripts/makefile.darwin b/scripts/makefile.darwin
index 4baf5be1..5d98166c 100644
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -22,7 +22,7 @@ ZLIBINC=../zlib
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 12
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 2c9f7375..ca091c8c 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -8,7 +8,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index a7fe690c..2c37afe1 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -16,7 +16,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index 817bf521..9fa2a2b0 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -17,7 +17,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hp64 b/scripts/makefile.hp64
index f654a114..fd37a2ad 100644
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpgcc b/scripts/makefile.hpgcc
index 58c6044c..0d76a106 100644
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index 999d6b62..e03e2a9b 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -21,7 +21,7 @@ ZLIBINC=/opt/zlib/include
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index ae2a8718..1dda9ab6 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.mingw b/scripts/makefile.mingw
index 3b9190da..e3363de1 100644
--- a/scripts/makefile.mingw
+++ b/scripts/makefile.mingw
@@ -81,7 +81,7 @@ CFLAGS= $(strip $(MINGW_CCFLAGS) $(addprefix -I,$(ZLIBINC)) \
 LIBNAME = libpng12
 PNGMAJ = 0
 MINGDLL = 12
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=libpng$(MINGDLL).dll
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 7e5377e5..e383490a 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng12
 
 LIB=	png12
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.51
+SHLIB_MINOR=	1.2.52beta01
 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 fc90f835..3de16454 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include
 
 LIB=	png
 SHLIB_MAJOR=	3
-SHLIB_MINOR=	1.2.51
+SHLIB_MINOR=	1.2.52beta01
 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 b29a7ca3..9dae9d03 100644
--- a/scripts/makefile.nommx
+++ b/scripts/makefile.nommx
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index f055da9e..02efbc74 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.2.51
+SHLIB_MINOR=	1.2.52beta01
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 11e8030c..f03fe9fd 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -12,7 +12,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index ad82f9dd..9db08ed6 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index 807025f6..37f9e92e 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -9,7 +9,7 @@
 # Library name:
 LIBNAME=libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.so9 b/scripts/makefile.so9
index aa663fd5..234c7e49 100644
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -11,7 +11,7 @@
 
 # Library name:
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 LIBNAME = libpng12
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index 59048d0d..f5301fd3 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/makefile.solaris-x86 b/scripts/makefile.solaris-x86
index 1f6551c6..10d0383a 100644
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -11,7 +11,7 @@
 # Library name:
 LIBNAME = libpng12
 PNGMAJ = 0
-PNGMIN = 1.2.51
+PNGMIN = 1.2.52beta01
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # Shared library names:
diff --git a/scripts/png32ce.def b/scripts/png32ce.def
index a64f4df8..0cc13cc9 100644
--- a/scripts/png32ce.def
+++ b/scripts/png32ce.def
@@ -5,7 +5,7 @@
 LIBRARY lpngce
 
 EXPORTS
-;Version 1.2.51
+;Version 1.2.52beta01
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
diff --git a/scripts/pngos2.def b/scripts/pngos2.def
index afe7b6c9..135839e0 100644
--- a/scripts/pngos2.def
+++ b/scripts/pngos2.def
@@ -2,7 +2,7 @@
 ; PNG.LIB module definition file for OS/2
 ;----------------------------------------
 
-; Version 1.2.51
+; Version 1.2.52beta01
 
 LIBRARY		PNG
 DESCRIPTION	"PNG image compression library for OS/2"
diff --git a/scripts/pngw32.def b/scripts/pngw32.def
index bc5b7db4..eb167321 100644
--- a/scripts/pngw32.def
+++ b/scripts/pngw32.def
@@ -5,7 +5,7 @@
 LIBRARY
 
 EXPORTS
-;Version 1.2.51
+;Version 1.2.52beta01
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3