diff --git a/ANNOUNCE b/ANNOUNCE
index a34874e..5f68888 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.33beta03 - September 14, 2017
+Libpng 1.6.33beta04 - September 14, 2017
 
 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.
@@ -8,20 +8,20 @@
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   1.6.33beta03.tar.xz (LZMA-compressed, recommended)
-   1.6.33beta03.tar.gz
+   1.6.33beta04.tar.xz (LZMA-compressed, recommended)
+   1.6.33beta04.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lp1633b03.7z  (LZMA-compressed, recommended)
-   lp1633b03.zip
+   lp1633b04.7z  (LZMA-compressed, recommended)
+   lp1633b04.zip
 
 Other information:
 
-   1.6.33beta03-README.txt
-   1.6.33beta03-LICENSE.txt
-   libpng-1.6.33beta03-*.asc (armored detached GPG signatures)
+   1.6.33beta04-README.txt
+   1.6.33beta04-LICENSE.txt
+   libpng-1.6.33beta04-*.asc (armored detached GPG signatures)
 
 Changes since the last public release (1.6.32):
 Version 1.6.33beta01 [August 28, 2017]
@@ -46,6 +46,8 @@
   Use pnglibconf.h.prebuilt when building for ANDROID with cmake (Github
     issue 162, by rcdailey).
 
+Version 1.6.33beta04 [September 14, 2017]
+
 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/CHANGES b/CHANGES
index 5e08e6d..1ad4ca2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6016,6 +6016,8 @@
   Use pnglibconf.h.prebuilt when building for ANDROID with cmake (Github
     issue 162, by rcdailey).
 
+Version 1.6.33beta04 [September 14, 2017]
+
 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 7c7a30e..8b3f44c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -844,7 +844,7 @@
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(png PROPERTIES
-#   VERSION 16.${PNGLIB_RELEASE}.1.6.33beta03
+#   VERSION 16.${PNGLIB_RELEASE}.1.6.33beta04
     VERSION 16.${PNGLIB_RELEASE}.0
     SOVERSION 16
     CLEAN_DIRECT_OUTPUT 1)
diff --git a/LICENSE b/LICENSE
index d496790..cbdbca3 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.0.7, July 1, 2000 through 1.6.33beta03, September 14, 2017 are
+libpng versions 1.0.7, July 1, 2000 through 1.6.33beta04, September 14, 2017 are
 Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
diff --git a/README b/README
index 38aa353..e051289 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.6.33beta03 - September 14, 2017 (shared library 16.0)
+README for libpng version 1.6.33beta04 - September 14, 2017 (shared library 16.0)
 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.ac b/configure.ac
index 5dcc00c..3b142dd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.33beta03],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.33beta04],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -46,7 +46,7 @@
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.33beta03
+PNGLIB_VERSION=1.6.33beta04
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=33
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 791767a..42e88f9 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 1.6.33beta03 - September 14, 2017
+ libpng version 1.6.33beta04 - September 14, 2017
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2017 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.33beta03 - September 14, 2017
+ libpng versions 0.97, January 1998, through 1.6.33beta04 - September 14, 2017
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2017 Glenn Randers-Pehrson
 
@@ -5405,7 +5405,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.33beta03 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.33beta04 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
diff --git a/libpng.3 b/libpng.3
index 44c8cb4..6885625 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
 .TH LIBPNG 3 "September 14, 2017"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.33beta03
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.33beta04
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -518,7 +518,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.33beta03 - September 14, 2017
+ libpng version 1.6.33beta04 - September 14, 2017
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2017 Glenn Randers-Pehrson
@@ -529,7 +529,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.33beta03 - September 14, 2017
+ libpng versions 0.97, January 1998, through 1.6.33beta04 - September 14, 2017
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2017 Glenn Randers-Pehrson
 
@@ -5923,7 +5923,7 @@
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.33beta03 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.33beta04 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
@@ -6081,7 +6081,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.33beta03 - September 14, 2017:
+Libpng version 1.6.33beta04 - September 14, 2017:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6106,7 +6106,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.0.7, July 1, 2000 through 1.6.33beta03, September 14, 2017 are
+libpng versions 1.0.7, July 1, 2000 through 1.6.33beta04, September 14, 2017 are
 Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
diff --git a/libpngpf.3 b/libpngpf.3
index 893cff7..6eae4cf 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
 .TH LIBPNGPF 3 "April 1, 2017"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.33beta03
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.33beta04
 (private functions)
 .SH SYNOPSIS
 \fB\fB#include \fI\fI"pngpriv.h"
diff --git a/png.c b/png.c
index 01abb2b..e2294db 100644
--- a/png.c
+++ b/png.c
@@ -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_6_33beta03 Your_png_h_is_not_version_1_6_33beta03;
+typedef png_libpng_version_1_6_33beta04 Your_png_h_is_not_version_1_6_33beta04;
 
 #ifdef __GNUC__
 /* The version tests may need to be added to, but the problem warning has
@@ -816,14 +816,14 @@
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.33beta03 - September 14, 2017" PNG_STRING_NEWLINE \
+      "libpng version 1.6.33beta04 - September 14, 2017" PNG_STRING_NEWLINE \
       "Copyright (c) 1998-2002,2004,2006-2017 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 1.6.33beta03 - September 14, 2017\
+   return "libpng version 1.6.33beta04 - September 14, 2017\
       Copyright (c) 1998-2002,2004,2006-2017 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 552fb4d..ba31c13 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.33beta03, September 14, 2017
+ * libpng version 1.6.33beta04, September 14, 2017
  *
  * Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -12,7 +12,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.6.33beta03, September 14, 2017:
+ *   libpng versions 0.97, January 1998, through 1.6.33beta04, September 14, 2017:
  *     Glenn Randers-Pehrson.
  *   See also "Contributing Authors", below.
  */
@@ -25,7 +25,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.0.7, July 1, 2000 through 1.6.33beta03, September 14, 2017 are
+ * libpng versions 1.0.7, July 1, 2000 through 1.6.33beta04, September 14, 2017 are
  * Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
  * derived from libpng-1.0.6, and are distributed according to the same
  * disclaimer and license as libpng-1.0.6 with the following individuals
@@ -247,7 +247,7 @@
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.6.33beta03 are Y2K compliant.  It is my belief that
+ *    upward through 1.6.33beta04 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
@@ -309,8 +309,8 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.33beta03"
-#define PNG_HEADER_VERSION_STRING " libpng version 1.6.33beta03 - September 14, 2017\n"
+#define PNG_LIBPNG_VER_STRING "1.6.33beta04"
+#define PNG_HEADER_VERSION_STRING " libpng version 1.6.33beta04 - September 14, 2017\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
@@ -324,7 +324,7 @@
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
  */
 
-#define PNG_LIBPNG_VER_BUILD  03
+#define PNG_LIBPNG_VER_BUILD  04
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -459,7 +459,7 @@
 /* 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_6_33beta03;
+typedef char* png_libpng_version_1_6_33beta04;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
diff --git a/pngconf.h b/pngconf.h
index 085b7b8..20e36c0 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.6.33beta03, September 14, 2017
+ * libpng version 1.6.33beta04, September 14, 2017
  *
  * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngtest.c b/pngtest.c
index fcdfa4b..3c04849 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -2153,4 +2153,4 @@
 #endif
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_33beta03 Your_png_h_is_not_version_1_6_33beta03;
+typedef png_libpng_version_1_6_33beta04 Your_png_h_is_not_version_1_6_33beta04;
diff --git a/projects/vstudio/README.txt b/projects/vstudio/README.txt
index f1bc7c3..39e8cb9 100644
--- a/projects/vstudio/README.txt
+++ b/projects/vstudio/README.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.6.33beta03 - September 14, 2017
+libpng version 1.6.33beta04 - September 14, 2017
 
 Copyright (c) 2010,2013,2015 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index 5cac0e7..2038e69 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.6.33beta03 - September 14, 2017
+ * libpng version 1.6.33beta04 - September 14, 2017
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index 6ad142e..07c7006 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,11 +1,11 @@
 
-Makefiles for  libpng version 1.6.33beta03 - September 14, 2017
+Makefiles for  libpng version 1.6.33beta04 - September 14, 2017
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng16.so.16.1.6.33beta03)
+                       (gcc, creates libpng16.so.16.1.6.33beta04)
  makefile.linux-opt=>  Linux/ELF makefile with hardware optimizations on
-                       (gcc, creates libpng16.so.16.1.6.33beta03)
+                       (gcc, creates libpng16.so.16.1.6.33beta04)
  makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
  makefile.knr      =>  Archaic UNIX Makefile that converts files with
                        ansi2knr (Requires ansi2knr.c from
@@ -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 libpng16.so.16.1.6.33beta03)
+                       creates libpng16.so.16.1.6.33beta04)
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
  makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng16.so.16.1.6.33beta03)
+                       creates libpng16.so.16.1.6.33beta04)
  makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng16.so.16.1.6.33beta03)
+                       creates libpng16.so.16.1.6.33beta04)
  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/def.c b/scripts/def.c
index 48a238e..1130191 100644
--- a/scripts/def.c
+++ b/scripts/def.c
@@ -21,7 +21,7 @@
 PNG_DFN "OS2 CODE PRELOAD MOVEABLE DISCARDABLE"
 PNG_DFN ""
 PNG_DFN "EXPORTS"
-PNG_DFN ";Version 1.6.33beta03"
+PNG_DFN ";Version 1.6.33beta04"
 
 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
         PNG_DFN "@" SYMBOL_PREFIX "@@" name "@"
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 1ffe3e5..7f2cec8 100644
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.33beta03
+version=1.6.33beta04
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index fd99925..0ff8e6d 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.6.33beta03
+Version: 1.6.33beta04
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}
diff --git a/scripts/makefile.ne12bsd b/scripts/makefile.ne12bsd
index 7cbb841..0d03e41 100644
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@
 
 LIB=	png16
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.6.33beta03
+SHLIB_MINOR=	1.6.33beta04
 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 08d19db..df1f490 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@
 
 LIB=	png
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.33beta03
+SHLIB_MINOR=	1.6.33beta04
 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 7364dce..a6e9448 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.33beta03
+SHLIB_MINOR=	1.6.33beta04
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index 8ee5297..58b0b15 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,8 +1,8 @@
-/* libpng 1.6.33beta03 STANDARD API DEFINITION */
+/* libpng 1.6.33beta04 STANDARD API DEFINITION */
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng version 1.6.33beta03 - September 14, 2017 */
+/* Libpng version 1.6.33beta04 - September 14, 2017 */
 
 /* Copyright (c) 1998-2017 Glenn Randers-Pehrson */
 
diff --git a/scripts/symbols.def b/scripts/symbols.def
index 6ebbbcc..2201daa 100644
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -1,4 +1,4 @@
-;Version 1.6.33beta03
+;Version 1.6.33beta04
 ;--------------------------------------------------------------
 ; LIBPNG symbol list as a Win32 DEF file
 ; Contains all the symbols that can be exported from libpng