diff --git a/ANNOUNCE b/ANNOUNCE
index 1efb25b9..bd7b7749 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.0.9beta3 - November 23, 2000
+Libpng 1.0.9beta4 - December 1, 2000
 
 This is a public release of libpng, intended for use in production codes.
 
@@ -29,9 +29,11 @@ Changes since the last public release (1.0.8):
   Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
   Add error message in png_set_compression_buffer_size() when malloc fails.
   Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
-  Ifdef'ed out the png_flush() in pngwrite.c that crashes some applications
+  Removed the png_flush() in pngwrite.c that crashes some applications
     that don't set png_output_flush_fn.
   Added makefile.macosx and makefile.aix to scripts directory.
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
diff --git a/CHANGES b/CHANGES
index cc9d34c9..fa8c85a7 100644
--- a/CHANGES
+++ b/CHANGES
@@ -798,7 +798,6 @@ version 1.0.7rc2 [June 28, 2000]
   Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
 version 1.0.7 [July 1, 2000]
   Revised the definition of "trans_values" in libpng.3/libpng.txt
-version 1.0.9beta3 [November 23, 2000]
 version 1.0.8beta1 [July 8, 2000]
   Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
   Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
@@ -850,9 +849,12 @@ version 1.0.9beta2 [November 19, 2000]
   Add error message in png_set_compression_buffer_size() when malloc fails.
 version 1.0.9beta3 [November 23, 2000]
   Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
-  Ifdef'ed out the png_flush() in pngwrite.c that crashes some applications
+  Removed the png_flush() in pngwrite.c that crashes some applications
     that don't set png_output_flush_fn.
   Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+  Change png_chunk_warning to png_warning in png_check_keyword().
+  Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
 
 Send comments/corrections/commendations to
 png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
diff --git a/INSTALL b/INSTALL
index ae8aae14..1055c9eb 100644
--- a/INSTALL
+++ b/INSTALL
@@ -1,5 +1,5 @@
 
-Installing libpng version 1.0.9beta3 - November 23, 2000
+Installing libpng version 1.0.9beta4 - December 1, 2000
 
 Before installing libpng, you must first install zlib.  zlib
 can usually be found wherever you got libpng.  zlib can be
@@ -10,7 +10,7 @@ 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-1.0.9beta3" or "lpng109" and "zlib-1.1.3"
+might be called "libpng-1.0.9beta4" or "lpng109" and "zlib-1.1.3"
 or "zlib113") so that you have directories called "zlib" and "libpng".
 
 Your directory structure should look like this:
@@ -59,8 +59,8 @@ The files that are presently available in the scripts directory
 include
 
  makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
- makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta3)
- makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta3,
+ makefile.linux    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta4)
+ makefile.gcmmx    =>  Linux/ELF makefile (gcc, creates libpng.so.2.1.0.9beta4,
                        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
@@ -75,9 +75,9 @@ include
  libpng.icc        =>  Project file for IBM VisualAge/C++ version 4.0 or later
  makefile.macosx   =>  MACOS X Makefile
  makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
- makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta3)
+ makefile.sggcc    =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta4)
  makefile.sunos    =>  Sun makefile
- makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.9beta3)
+ makefile.solaris  =>  Solaris 2.X makefile (gcc, creates libpng.so.2.1.0.9beta4)
  makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
  makefile.mips     =>  MIPS makefile
  makefile.acorn    =>  Acorn makefile
diff --git a/KNOWNBUG b/KNOWNBUG
index d879ce0d..3f057d2a 100644
--- a/KNOWNBUG
+++ b/KNOWNBUG
@@ -1,14 +1,21 @@
 
 Known bugs and suggested enhancements in libpng-1.0.8
 
-0: November 3, 2000 -- BUG -- incorrect iCCP chunk is written
+1: November 28, 2000 -- BUG -- buffer overflow in png_chunk_warning
+
+   A buffer overflow occurs in png_chunk_warning() because 16 bytes
+   are allocated for "[nn][nn][nn][nn]" which requires 18 bytes.
+
+   Status: Fixed in libpng-1.0.9beta4
+
+2: November 3, 2000 -- BUG -- incorrect iCCP chunk is written
 
    The compression_type byte in the iCCP chunk written by libpng is
    usually incorrect.
 
    Status: Fixed in libpng-1.0.9beta1
 
-1. October 12, 2000 -- BUG -- pngtest fails
+3. October 12, 2000 -- BUG -- pngtest fails
 
    The three WRITEFILE calls in pngtest.c are incorrect.  They must be
    changed to read
@@ -17,7 +24,7 @@ Known bugs and suggested enhancements in libpng-1.0.8
    WRITEFILE(io_ptr, near_data, length, check);
    WRITEFILE(io_ptr, buf, written, err);
 
-2. August 28, 2000 -- BUG -- pnggccrd.c
+4. August 28, 2000 -- BUG -- pnggccrd.c
 
    The interlacing() function has still not been fully converted and
    will not compile under gcc-2.95.2; it is currently ifdef'ed out.
@@ -26,7 +33,7 @@ Known bugs and suggested enhancements in libpng-1.0.8
    which have been fixed.  The replacement files are available at the
    PNG web site (http://www.libpng.org/pub/png).
 
-3. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
+5. March 15, 1998 -- OPTIMIZATION -- Kevin Bracey
 
    Loops need to be optimized everywhere
 
@@ -41,7 +48,7 @@ Known bugs and suggested enhancements in libpng-1.0.8
    libpng-2.0.0.  About 160 loops will be turned around
    in libpng-2.0.x betaxx, for testing.
 
-4. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
+6. July 4, 1998 -- ENHANCEMENT -- Glenn R-P
 
    libpng-1.0.5 and earlier transform colors to gamma=1.0 space for
    merging with background, and then back to the image's gamma.  The
@@ -53,7 +60,7 @@ Known bugs and suggested enhancements in libpng-1.0.8
 
    STATUS: under development.
 
-5. September 1999 -- ENHANCEMENT --
+7. September 1999 -- ENHANCEMENT --
 
    It should be possible to use libpng without floating-point arithmetic.
 
diff --git a/LICENSE b/LICENSE
index ebb8420d..cc28b894 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 1.0.7, July 1, 2000, through 1.0.9beta3, November 23, 2000, are
+libpng versions 1.0.7, July 1, 2000, through 1.0.9beta4, December 1, 2000, are
 Copyright (c) 2000 Glenn Randers-Pehrson
 and are distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors
@@ -99,4 +99,4 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 23, 2000
+December 1, 2000
diff --git a/README b/README
index eb82e276..f86a340f 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng 1.0.9beta3 - November 23, 2000 (shared library 2.1)
+README for libpng 1.0.9beta4 - December 1, 2000 (shared library 2.1)
 See the note about version numbers near the top of png.h
 
 See INSTALL for instructions on how to install libpng.
@@ -182,9 +182,9 @@ Files in this distribution:
        descrip.mms      =>  VMS makefile for MMS or MMK
        makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
        makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng.so.2.1.0.9beta3)
+                            (gcc, creates libpng.so.2.1.0.9beta4)
        makefile.gcmmx   =>  Linux/ELF makefile (gcc, creates
-                            libpng.so.2.1.0.9beta3, uses assembler code
+                            libpng.so.2.1.0.9beta4, 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
@@ -199,10 +199,10 @@ Files in this distribution:
        libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
        makefile.macosx  =>  MACOS X Makefile
        makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta3)
+       makefile.sggcc   =>  Silicon Graphics (gcc, creates libpng.so.2.1.0.9beta4)
        makefile.sunos   =>  Sun makefile
        makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng.so.2.1.0.9beta3)
+                            (gcc, creates libpng.so.2.1.0.9beta4)
        makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
        makefile.mips    =>  MIPS makefile
        makefile.acorn   =>  Acorn makefile
diff --git a/Y2KINFO b/Y2KINFO
index 7257d4a9..257dbe59 100644
--- a/Y2KINFO
+++ b/Y2KINFO
@@ -1,13 +1,13 @@
    Y2K compliance in libpng:
    =========================
 
-      November 23, 2000
+      December 1, 2000
 
       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 1.0.9beta3 are Y2K compliant.  It is my belief that earlier
+      upward through 1.0.9beta4 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 4629d24e..ba46555c 100755
--- a/configure
+++ b/configure
@@ -1,5 +1,5 @@
 echo "
-  There is no \"configure\" script for Libpng-1.0.9beta3.  Instead, please
+  There is no \"configure\" script for Libpng-1.0.9beta4.  Instead, please
   copy the appropriate makefile for your system from the \"scripts\"
   directory.  Read the INSTALL file for more details.
 "
diff --git a/libpng.3 b/libpng.3
index d32e6c13..73963867 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "November 23, 2000"
+.TH LIBPNG 3 "December 1, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta3
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta4
 .SH SYNOPSIS
 \fI\fB
 
@@ -747,7 +747,7 @@ 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 1.0.9beta3 - November 23, 2000
+ libpng version 1.0.9beta4 - December 1, 2000
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alum.rpi.edu>
  Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -3379,13 +3379,13 @@ application:
 
 .SH VII. Y2K Compliance in libpng
 
-November 23, 2000
+December 1, 2000
 
 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 1.0.9beta3 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.9beta4 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
@@ -3526,7 +3526,7 @@ possible without all of you.
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.0.9beta3 - November 23, 2000:
+Libpng version 1.0.9beta4 - December 1, 2000:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
 
@@ -3543,7 +3543,7 @@ included in the libpng distribution, the latter shall prevail.)
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.0.7, July 1, 2000, through  1.0.9beta3, November 23, 2000, are
+libpng versions 1.0.7, July 1, 2000, through  1.0.9beta4, December 1, 2000, are
 Copyright (c) 2000 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.0.6
 with the following individuals added to the list of Contributing Authors
@@ -3634,7 +3634,7 @@ certification mark of the Open Source Initiative.
 
 Glenn Randers-Pehrson
 randeg@alum.rpi.edu
-November 23, 2000
+December 1, 2000
 
 .\" end of man page
 
diff --git a/libpng.txt b/libpng.txt
index 8299ed27..cf899496 100644
--- a/libpng.txt
+++ b/libpng.txt
@@ -1,6 +1,6 @@
 libpng.txt - A description on how to use and modify libpng
 
- libpng version 1.0.9beta3 - November 23, 2000
+ libpng version 1.0.9beta4 - December 1, 2000
  Updated and distributed by Glenn Randers-Pehrson
  <randeg@alum.rpi.edu>
  Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
@@ -2632,13 +2632,13 @@ application:
 
 VII. Y2K Compliance in libpng
 
-November 23, 2000
+December 1, 2000
 
 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 1.0.9beta3 are Y2K compliant.  It is my belief that earlier
+upward through 1.0.9beta4 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/libpngpf.3 b/libpngpf.3
index 1ff9fd27..ad39837a 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "November 23, 2000"
+.TH LIBPNGPF 3 "December 1, 2000"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta3
+libpng \- Portable Network Graphics (PNG) Reference Library 1.0.9beta4
 (private functions)
 .SH SYNOPSIS
 \fB#include <png.h>\fP
diff --git a/png.5 b/png.5
index 133b8f6a..1348b888 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "November 23, 2000"
+.TH PNG 5 "December 1, 2000"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.c b/png.c
index 09ed6d28..5f3a29e4 100644
--- a/png.c
+++ b/png.c
@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * libpng version 1.0.9beta3 - November 23, 2000
+ * libpng version 1.0.9beta4 - December 1, 2000
  * Copyright (c) 1998, 1999, 2000 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.)
@@ -13,14 +13,14 @@
 #include "png.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_9beta3 Your_png_h_is_not_version_1_0_9beta3;
+typedef version_1_0_9beta4 Your_png_h_is_not_version_1_0_9beta4;
 
 /* Version information for C files.  This had better match the version
  * string defined in png.h.  */
 
 #ifdef PNG_USE_GLOBAL_ARRAYS
 /* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = "1.0.9beta3";
+const char png_libpng_ver[18] = "1.0.9beta4";
 
 /* png_sig was changed to a function in version 1.0.5c */
 /* Place to hold the signature string for a PNG file. */
@@ -626,7 +626,7 @@ png_charp PNGAPI
 png_get_copyright(png_structp png_ptr)
 {
    if (png_ptr != NULL || png_ptr == NULL)  /* silence compiler warning */
-   return ((png_charp) "\n libpng version 1.0.9beta3 - November 23, 2000\n\
+   return ((png_charp) "\n libpng version 1.0.9beta4 - December 1, 2000\n\
    Copyright (c) 1998-2000 Glenn Randers-Pehrson\n\
    Copyright (c) 1996, 1997 Andreas Dilger\n\
    Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n");
@@ -644,8 +644,8 @@ png_get_libpng_ver(png_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
    if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
-      return((png_charp) "1.0.9beta3");
-   return((png_charp) "1.0.9beta3");
+      return((png_charp) "1.0.9beta4");
+   return((png_charp) "1.0.9beta4");
 }
 
 png_charp PNGAPI
diff --git a/png.h b/png.h
index 11fb2377..c6c0a191 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.0.9beta3 - November 23, 2000
+ * libpng version 1.0.9beta4 - December 1, 2000
  * Copyright (c) 1998, 1999, 2000 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 1.0.9beta3 - November 23, 2000: Glenn
+ *  libpng versions 0.97, January 1998, through 1.0.9beta4 - December 1, 2000: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -58,7 +58,7 @@
  *    1.0.8beta1-4                  10008  2.1.0.8beta1-4
  *    1.0.8rc1                      10008  2.1.0.8rc1
  *    1.0.8                         10008  2.1.0.8
- *    1.0.9beta1-2                  10009  2.1.0.9
+ *    1.0.9beta1-4                  10009  2.1.0.9beta1-4
  *
  *    Henceforth the source version will match the shared-library major
  *    and minor numbers; the shared-library major version number will be
@@ -85,7 +85,7 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta3, November 23, 2000, are
+ * libpng versions 1.0.7, July 1, 2000, through  1.0.9beta4, December 1, 2000, are
  * Copyright (c) 2000 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.0.6
  * with the following individuals added to the list of Contributing Authors
@@ -190,13 +190,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    November 23, 2000
+ *    December 1, 2000
  *
  *    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 1.0.9beta3 are Y2K compliant.  It is my belief that earlier
+ *    upward through 1.0.9beta4 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
@@ -252,7 +252,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.9beta3"
+#define PNG_LIBPNG_VER_STRING "1.0.9beta4"
 
 #define PNG_LIBPNG_VER_SONUM   2
 
@@ -263,7 +263,7 @@
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
 
-#define PNG_LIBPNG_VER_BUILD  3
+#define PNG_LIBPNG_VER_BUILD  4
 
 #define PNG_LIBPNG_BUILD_ALPHA    1
 #define PNG_LIBPNG_BUILD_BETA     2
@@ -1169,9 +1169,9 @@ struct png_struct_def
 };
 
 /* This prevents a compiler error in png_get_copyright() in png.c if png.c
-and png.h are both at * version 1.0.9beta3
+and png.h are both at * version 1.0.9beta4
  */
-typedef png_structp version_1_0_9beta3;
+typedef png_structp version_1_0_9beta4;
 
 typedef png_struct FAR * FAR * png_structpp;
 
@@ -2210,7 +2210,7 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #endif
 
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.0.9beta3 - November 23, 2000 (header)\n"
+   " libpng version 1.0.9beta4 - December 1, 2000 (header)\n"
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
diff --git a/pngasmrd.h b/pngasmrd.h
index 00b9ab81..5cb21557 100644
--- a/pngasmrd.h
+++ b/pngasmrd.h
@@ -1,6 +1,6 @@
 /* pngasmrd.h - assembler version of utilities to read a PNG file
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1999, 2000 Glenn Randers-Pehrson
  *
diff --git a/pngconf.h b/pngconf.h
index a7e04121..9364e500 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,6 +1,6 @@
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngerror.c b/pngerror.c
index 0b779913..bc6920bd 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -99,7 +99,7 @@ png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message
 void PNGAPI
 png_chunk_error(png_structp png_ptr, png_const_charp message)
 {
-   char msg[16+64];
+   char msg[18+64];
    png_format_buffer(png_ptr, msg, message);
    png_error(png_ptr, msg);
 }
diff --git a/pnggccrd.c b/pnggccrd.c
index 483c7411..b7c89bee 100644
--- a/pnggccrd.c
+++ b/pnggccrd.c
@@ -6,7 +6,7 @@
  *     and http://www.intel.com/drg/pentiumII/appnotes/923/923.htm
  *     for Intel's performance analysis of the MMX vs. non-MMX code.
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation
diff --git a/pngget.c b/pngget.c
index 08bf599c..d61eac6c 100644
--- a/pngget.c
+++ b/pngget.c
@@ -1,7 +1,7 @@
 
 /* pngget.c - retrieval of values from info struct
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngmem.c b/pngmem.c
index 3943f8b3..3c7d82fd 100644
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@
 
 /* pngmem.c - stub functions for memory allocation
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngpread.c b/pngpread.c
index cee670dd..3a4d4967 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngread.c b/pngread.c
index 4d1bf446..98178bd9 100644
--- a/pngread.c
+++ b/pngread.c
@@ -1,7 +1,7 @@
 
 /* pngread.c - read a PNG file
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -701,7 +701,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
  * not called png_set_interlace_handling(), the display_row buffer will
  * be ignored, so pass NULL to it.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta3
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta4
  */
 
 void PNGAPI
@@ -750,7 +750,7 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
  * only call this function once.  If you desire to have an image for
  * each pass of a interlaced image, use png_read_rows() instead.
  *
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta3
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.9beta4
  */
 void PNGAPI
 png_read_image(png_structp png_ptr, png_bytepp image)
diff --git a/pngrio.c b/pngrio.c
index 6671c970..b28529ff 100644
--- a/pngrio.c
+++ b/pngrio.c
@@ -1,7 +1,7 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngrtran.c b/pngrtran.c
index aa5f05d1..845d0efd 100644
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngrutil.c b/pngrutil.c
index 9ff60de7..7e42af53 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@
 
 /* pngrutil.c - utilities to read a PNG file
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngset.c b/pngset.c
index 5f9ed298..4f91b528 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngtest.c b/pngtest.c
index 0dc6e9ee..8c45868f 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,7 +1,7 @@
 
 /* pngtest.c - a simple test program to test libpng
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -1449,4 +1449,4 @@ main(int argc, char *argv[])
 }
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_0_9beta3 your_png_h_is_not_version_1_0_9beta3;
+typedef version_1_0_9beta4 your_png_h_is_not_version_1_0_9beta4;
diff --git a/pngtrans.c b/pngtrans.c
index af553bc7..557975e8 100644
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,7 +1,7 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngvcrd.c b/pngvcrd.c
index 3d394df6..a15bf66a 100644
--- a/pngvcrd.c
+++ b/pngvcrd.c
@@ -2,7 +2,7 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * Copyright (c) 1998, Intel Corporation
diff --git a/pngwio.c b/pngwio.c
index 320989f8..52a52588 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,7 +1,7 @@
 
 /* pngwio.c - functions for data output
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngwrite.c b/pngwrite.c
index bffad0f0..9f48b44e 100644
--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,7 +1,7 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngwtran.c b/pngwtran.c
index ace6532f..8da3dad1 100644
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,7 +1,7 @@
 
 /* pngwtran.c - transforms the data in a row for PNG writers
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
diff --git a/pngwutil.c b/pngwutil.c
index 6aa1c4e3..d3415f5d 100644
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,7 +1,7 @@
 
 /* pngwutil.c - utilities to write a PNG file
  *
- * libpng 1.0.9beta3 - November 23, 2000
+ * libpng 1.0.9beta4 - December 1, 2000
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -1072,13 +1072,14 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    png_size_t key_len;
    png_charp kp, dp;
    int kflag;
+   int kwarn=0;
 
    png_debug(1, "in png_check_keyword\n");
    *new_key = NULL;
 
    if (key == NULL || (key_len = png_strlen(key)) == 0)
    {
-      png_chunk_warning(png_ptr, "zero length keyword");
+      png_warning(png_ptr, "zero length keyword");
       return ((png_size_t)0);
    }
 
@@ -1095,9 +1096,9 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
          char msg[40];
 
          sprintf(msg, "invalid keyword character 0x%02X", *kp);
-         png_chunk_warning(png_ptr, msg);
+         png_warning(png_ptr, msg);
 #else
-         png_chunk_warning(png_ptr, "invalid character in keyword");
+         png_warning(png_ptr, "invalid character in keyword");
 #endif
          *dp = ' ';
       }
@@ -1112,7 +1113,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key + key_len - 1;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "trailing spaces removed from keyword");
+      png_warning(png_ptr, "trailing spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1125,7 +1126,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
    kp = *new_key;
    if (*kp == ' ')
    {
-      png_chunk_warning(png_ptr, "leading spaces removed from keyword");
+      png_warning(png_ptr, "leading spaces removed from keyword");
 
       while (*kp == ' ')
       {
@@ -1147,6 +1148,7 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       else if (*kp == ' ')
       {
          key_len--;
+         kwarn=1;
       }
       else
       {
@@ -1155,17 +1157,19 @@ png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
       }
    }
    *dp = '\0';
+   if(kwarn)
+      png_warning(png_ptr, "extra interior spaces removed from keyword");
 
    if (key_len == 0)
    {
       png_free(png_ptr, *new_key);
       *new_key=NULL;
-      png_chunk_warning(png_ptr, "Zero length keyword");
+      png_warning(png_ptr, "Zero length keyword");
    }
 
    if (key_len > 79)
    {
-      png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters");
+      png_warning(png_ptr, "keyword length must be 1 - 79 characters");
       new_key[79] = '\0';
       key_len = 79;
    }
diff --git a/projects/msvc/README.txt b/projects/msvc/README.txt
index f2a5f86f..9be4b883 100644
--- a/projects/msvc/README.txt
+++ b/projects/msvc/README.txt
@@ -1,5 +1,5 @@
 Microsoft Developer Studio Build File, Format Version 6.00 for
-libpng 1.0.9beta3 (November 23, 2000) and zlib
+libpng 1.0.9beta4 (December 1, 2000) and zlib
 
 Copyright (C) 2000 Simon-Pierre Cadieux
 For conditions of distribution and use, see copyright notice in png.h
diff --git a/projects/msvc/png32ms.def b/projects/msvc/png32ms.def
index 9aa8885f..4c6c18cf 100644
--- a/projects/msvc/png32ms.def
+++ b/projects/msvc/png32ms.def
@@ -6,7 +6,7 @@ LIBRARY
 DESCRIPTION "PNG image compression library for Windows"
 
 EXPORTS
-;Version 1.0.9beta3
+;Version 1.0.9beta4
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
diff --git a/projects/wince/READMEE.WCE b/projects/wince/READMEE.WCE
index 54f697ef..49da5550 100644
--- a/projects/wince/READMEE.WCE
+++ b/projects/wince/READMEE.WCE
@@ -8,9 +8,9 @@ libpng for WindowsCE Rel.1.0
 
 Introduction
 ============
-This is libpng 1.0.9beta3 ported to WindowsCE 2.0 and 2.11.
-libpng 1.0.9beta3 is a PNG reference library.
-See README, a document of original libpng 1.0.9beta3.
+This is libpng 1.0.9beta4 ported to WindowsCE 2.0 and 2.11.
+libpng 1.0.9beta4 is a PNG reference library.
+See README, a document of original libpng 1.0.9beta4.
 
 zlib for WindowsCE
 ==================
@@ -23,7 +23,7 @@ This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.
 
-See README and LICENSE, documents of original libpng 1.0.9beta3, for conditions
+See README and LICENSE, documents of original libpng 1.0.9beta4, for conditions
 of use and distribution.
 
 Files
diff --git a/projects/wince/READMEJ.WCE b/projects/wince/READMEJ.WCE
index bf0ef598..918dc821 100644
--- a/projects/wince/READMEJ.WCE
+++ b/projects/wince/READMEJ.WCE
@@ -24,7 +24,7 @@ libpng
 になったいかなる被害についても、作者、配布者、その他利用者以外の人物、
 団体に責任をとる義務はないものとします。
 
-その他、このソフトウェアの利用条件については、原版である libpng 1.0.9beta3に
+その他、このソフトウェアの利用条件については、原版である libpng 1.0.9beta4に
 準拠するものとします。詳しくは、付属の README,LICENSE をお読みください。
 
 収録内容
diff --git a/projects/wince/png32ce.def b/projects/wince/png32ce.def
index af70b161..ee8a6843 100644
--- a/projects/wince/png32ce.def
+++ b/projects/wince/png32ce.def
@@ -5,7 +5,7 @@
 LIBRARY lpngce
 
 EXPORTS
-;Version 1.0.9beta3
+;Version 1.0.9beta4
   png_build_grayscale_palette  @1
   png_check_sig        @2
   png_chunk_error      @3
diff --git a/scripts/makefile.aix b/scripts/makefile.aix
index e53d8b78..91f0c14c 100644
--- a/scripts/makefile.aix
+++ b/scripts/makefile.aix
@@ -18,7 +18,7 @@ RM = rm -f
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 prefix=/usr/local
diff --git a/scripts/makefile.beos b/scripts/makefile.beos
index 3f7c16bb..f54169e8 100644
--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -31,7 +31,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a, libpng.so*, and png.h
diff --git a/scripts/makefile.cygwin b/scripts/makefile.cygwin
index be674b31..18c87057 100644
--- a/scripts/makefile.cygwin
+++ b/scripts/makefile.cygwin
@@ -38,7 +38,7 @@ CFLAGS=-I$(ZLIBINC) -Wall -O3 $(ALIGN) -funroll-loops \
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 SHAREDLIB=cygpng$(PNGMAJ).dll
diff --git a/scripts/makefile.dec b/scripts/makefile.dec
index 1665c58d..6893bc15 100644
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -17,7 +17,7 @@ ZLIBINC=../zlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 CC=cc
diff --git a/scripts/makefile.gcmmx b/scripts/makefile.gcmmx
index 80891b9b..6a295a2e 100644
--- a/scripts/makefile.gcmmx
+++ b/scripts/makefile.gcmmx
@@ -37,7 +37,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index baf67049..89bb5329 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -18,7 +18,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 # where make install puts libpng.a and png.h
diff --git a/scripts/makefile.linux b/scripts/makefile.linux
index 3b88176a..f17f6483 100644
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -34,7 +34,7 @@ RANLIB=ranlib
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include
diff --git a/scripts/makefile.sco b/scripts/makefile.sco
index 38f92b1c..894ca88d 100644
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -25,7 +25,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include
diff --git a/scripts/makefile.sggcc b/scripts/makefile.sggcc
index 978baef4..a2af909b 100644
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -19,8 +19,8 @@ CFLAGS=-I$(ZLIBINC) -O2 $(WARNMORE) -fPIC -mabi=n32 # -g -DPNG_DEBUG=5
 LDFLAGS=-L. -L$(ZLIBLIB) -lpng -lz -lm
 LDSHARED=gcc -shared
 
-VER=1.0.9beta3
-LIBS=libpng.so.1.0.9beta3
+VER=1.0.9beta4
+LIBS=libpng.so.1.0.9beta4
 SHAREDLIB=libpng.so
 libdir=$(prefix)/lib32
 
diff --git a/scripts/makefile.solaris b/scripts/makefile.solaris
index eb8cf32f..e78d00ae 100644
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -31,7 +31,7 @@ RANLIB=echo
 # read libpng.txt or png.h to see why PNGMAJ is 2.  You should not
 # have to change it.
 PNGMAJ = 2
-PNGMIN = 1.0.9beta3
+PNGMIN = 1.0.9beta4
 PNGVER = $(PNGMAJ).$(PNGMIN)
 
 INCPATH=$(prefix)/include
diff --git a/scripts/pngdef.pas b/scripts/pngdef.pas
index 23946aab..875cfb4d 100644
--- a/scripts/pngdef.pas
+++ b/scripts/pngdef.pas
@@ -5,7 +5,7 @@ unit pngdef;
 interface
 
 const
-  PNG_LIBPNG_VER_STRING = '1.0.9beta3';
+  PNG_LIBPNG_VER_STRING = '1.0.9beta4';
   PNG_LIBPNG_VER        =  10009;
 
 type