diff --git a/LICENSE b/LICENSE
index 4987bf5..19983fa 100644
--- a/LICENSE
+++ b/LICENSE
@@ -10,7 +10,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 6, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 20, 2015, are
 Copyright (c) 2004, 2006-2015 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
@@ -108,4 +108,4 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 6, 2015
+May 20, 2015
diff --git a/README b/README
index 46903c6..81dd9e4 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.6.18beta04 - May 6, 2015 (shared library 16.0)
+README for libpng version 1.6.18beta04 - May 20, 2015 (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.
@@ -134,7 +134,7 @@
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for nineteen years now, and it is official and
+been discussing PNG for twenty years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used immediately,
 it may be used later.
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 7be0fd2..fd84287 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 1.6.18beta04 - May 7, 2015
+ libpng version 1.6.18beta04 - May 20, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.18beta04 - May 7, 2015
+ libpng versions 0.97, January 1998, through 1.6.18beta04 - May 20, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -5297,7 +5297,7 @@
 
 XVI. Y2K Compliance in libpng
 
-May 7, 2015
+May 20, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
diff --git a/libpng.3 b/libpng.3
index 3c308f0..2ea69a3 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,4 +1,4 @@
-.TH LIBPNG 3 "May 7, 2015"
+.TH LIBPNG 3 "May 20, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.6.18beta04
 .SH SYNOPSIS
@@ -504,7 +504,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.18beta04 - May 7, 2015
+ libpng version 1.6.18beta04 - May 20, 2015
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
@@ -515,7 +515,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.18beta04 - May 7, 2015
+ libpng versions 0.97, January 1998, through 1.6.18beta04 - May 20, 2015
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2015 Glenn Randers-Pehrson
 
@@ -5801,7 +5801,7 @@
 
 .SH XVI. Y2K Compliance in libpng
 
-May 7, 2015
+May 20, 2015
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
@@ -6119,7 +6119,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.18beta04 - May 7, 2015:
+Libpng version 1.6.18beta04 - May 20, 2015:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6142,7 +6142,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 7, 2015, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 20, 2015, are
 Copyright (c) 2004,2006-2015 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
@@ -6241,7 +6241,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 7, 2015
+May 20, 2015
 
 .\" end of man page
 
diff --git a/libpngpf.3 b/libpngpf.3
index b2e60b2..50f1759 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,4 +1,4 @@
-.TH LIBPNGPF 3 "May 6, 2015"
+.TH LIBPNGPF 3 "May 20, 2015"
 .SH NAME
 libpng \- Portable Network Graphics (PNG) Reference Library 1.6.18beta04
 (private functions)
diff --git a/png.5 b/png.5
index bc5a7db..f8ae095 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "May 6, 2015"
+.TH PNG 5 "May 20, 2015"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
diff --git a/png.h b/png.h
index a3eb417..989854e 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.18beta04, May 6, 2015
+ * libpng version 1.6.18beta04, May 20, 2015
  *
  * Copyright (c) 1998-2015 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 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.6.18beta04, May 6, 2015: Glenn
+ *   libpng versions 0.97, January 1998, through 1.6.18beta04, May 20, 2015: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -248,7 +248,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 6, 2015, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.6.18beta04, May 20, 2015, are
  * Copyright (c) 2004, 2006-2015 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:
@@ -360,7 +360,7 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 6, 2015
+ *    May 20, 2015
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
@@ -430,7 +430,7 @@
 /* Version information for png.h - this should match the version in png.c */
 #define PNG_LIBPNG_VER_STRING "1.6.18beta04"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.6.18beta04 - May 6, 2015\n"
+     " libpng version 1.6.18beta04 - May 20, 2015\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
diff --git a/projects/vstudio/readme.txt b/projects/vstudio/readme.txt
index a638a3a..65ee922 100644
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@
 
 VisualStudio instructions
 
-libpng version 1.6.18beta04 - May 6, 2015
+libpng version 1.6.18beta04 - May 20, 2015
 
 Copyright (c) 1998-2010 Glenn Randers-Pehrson
 
diff --git a/projects/vstudio/zlib.props b/projects/vstudio/zlib.props
index a152927..e98e7c1 100644
--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
  * zlib.props - location of zlib source
  *
- * libpng version 1.6.18beta04 - May 6, 2015
+ * libpng version 1.6.18beta04 - May 20, 2015
  *
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  *
diff --git a/scripts/README.txt b/scripts/README.txt
index 4ef3b5e..c2a4c6e 100644
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,5 +1,5 @@
 
-Makefiles for  libpng version 1.6.18beta04 - May 6, 2015
+Makefiles for  libpng version 1.6.18beta04 - May 20, 2015
 
 pnglibconf.h.prebuilt       =>  Stores configuration settings
  makefile.linux    =>  Linux/ELF makefile
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index abe86b8..6d6c128 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -2,7 +2,7 @@
 
 /* pnglibconf.h - library build configuration */
 
-/* Libpng version 1.6.18beta04 - May 6, 2015 */
+/* Libpng version 1.6.18beta04 - May 20, 2015 */
 
 /* Copyright (c) 1998-2014 Glenn Randers-Pehrson */