diff --git a/ANNOUNCE b/ANNOUNCE
index 800446b05..44d6722d0 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-libpng 1.6.41 - January 24, 2024
+libpng 1.6.42 - January 29, 2024
 ================================
 
 This is a public release of libpng, intended for use in production code.
@@ -9,13 +9,13 @@ Files available for download
 
 Source files with LF line endings (for Unix/Linux):
 
- * libpng-1.6.41.tar.xz (LZMA-compressed, recommended)
- * libpng-1.6.41.tar.gz (deflate-compressed)
+ * libpng-1.6.42.tar.xz (LZMA-compressed, recommended)
+ * libpng-1.6.42.tar.gz (deflate-compressed)
 
 Source files with CRLF line endings (for Windows):
 
- * lpng1641.7z (LZMA-compressed, recommended)
- * lpng1641.zip (deflate-compressed)
+ * lpng1642.7z (LZMA-compressed, recommended)
+ * lpng1642.zip (deflate-compressed)
 
 Other information:
 
@@ -25,6 +25,14 @@ Other information:
  * TRADEMARK.md
 
 
+Changes from version 1.6.41 to version 1.6.42
+---------------------------------------------
+
+ * Fixed the implementation of the macro function `png_check_sig`.
+   This was an API regression, introduced in libpng-1.6.41.
+   (Reported by Matthieu Darbois)
+
+
 Changes from version 1.6.40 to version 1.6.41
 ---------------------------------------------
 
diff --git a/CHANGES b/CHANGES
index 2d9a57e43..137761a81 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6134,7 +6134,7 @@ Version 1.6.41 [January 24, 2024]
     (Contributed by GuXiWei, JinBo and ZhangLixia)
   Fixed the run-time discovery of MIPS MSA hardware.
     (Contributed by Sui Jingfeng)
-  Fixed an off-by-one error in the function `png_do_check_palette_indexes`,
+  Fixed an off-by-one error in the function png_do_check_palette_indexes(),
     which failed to recognize errors that might have existed in the first
     column of a broken palette-encoded image. This was a benign regression
     accidentally introduced in libpng-1.6.33. No pixel was harmed.
@@ -6161,6 +6161,11 @@ Version 1.6.41 [January 24, 2024]
   Improved the test coverage.
     (Contributed by John Bowler)
 
+Version 1.6.42 [January 29, 2024]
+  Fixed the implementation of the macro function png_check_sig().
+    This was an API regression, introduced in libpng-1.6.41.
+    (Reported by Matthieu Darbois)
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.
 Subscription is required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/README b/README
index 1f51a808f..0bf27bcfe 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-README for libpng version 1.6.41
+README for libpng version 1.6.42
 ================================
 
 See the note about version numbers near the top of `png.h`.
diff --git a/configure b/configure
index 5af26c75a..c562e6351 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for libpng 1.6.41.
+# Generated by GNU Autoconf 2.72 for libpng 1.6.42.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -614,8 +614,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.6.41'
-PACKAGE_STRING='libpng 1.6.41'
+PACKAGE_VERSION='1.6.42'
+PACKAGE_STRING='libpng 1.6.42'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1416,7 +1416,7 @@ 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 1.6.41 to adapt to many kinds of systems.
+'configure' configures libpng 1.6.42 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1487,7 +1487,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.6.41:";;
+     short | recursive ) echo "Configuration of libpng 1.6.42:";;
    esac
   cat <<\_ACEOF
 
@@ -1683,7 +1683,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.6.41
+libpng configure 1.6.42
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -1946,7 +1946,7 @@ 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 1.6.41, which was
+It was created by libpng $as_me 1.6.42, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3246,7 +3246,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.6.41'
+ VERSION='1.6.42'
 
 
 printf "%s\n" "#define PACKAGE \"$PACKAGE\"" >>confdefs.h
@@ -3379,7 +3379,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.6.41
+PNGLIB_VERSION=1.6.42
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=41
@@ -15382,7 +15382,7 @@ 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 1.6.41, which was
+This file was extended by libpng $as_me 1.6.42, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -15450,7 +15450,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-libpng config.status 1.6.41
+libpng config.status 1.6.42
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index d81a58002..612423406 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.41],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.42],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts/autoconf])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -46,7 +46,7 @@ dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.41
+PNGLIB_VERSION=1.6.42
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=41
diff --git a/libpng-manual.txt b/libpng-manual.txt
index acc12b307..eb24ef483 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -9,7 +9,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng version 1.6.36, December 2018, through 1.6.41 - January 2024
+ libpng version 1.6.36, December 2018, through 1.6.42 - January 2024
  Updated and distributed by Cosmin Truta
  Copyright (c) 2018-2024 Cosmin Truta
 
diff --git a/libpng.3 b/libpng.3
index cdc8d56de..57d06f2db 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "January 24, 2024"
+.TH LIBPNG 3 "January 29, 2024"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.41
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.42
 
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -528,7 +528,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng version 1.6.36, December 2018, through 1.6.41 - January 2024
+ libpng version 1.6.36, December 2018, through 1.6.42 - January 2024
  Updated and distributed by Cosmin Truta
  Copyright (c) 2018-2024 Cosmin Truta
 
diff --git a/libpngpf.3 b/libpngpf.3
index 610432dcb..a46920503 100644
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "January 24, 2024"
+.TH LIBPNGPF 3 "January 29, 2024"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.41
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.42
 (private functions)
 
 .SH SYNOPSIS
diff --git a/png.5 b/png.5
index e2c177a7e..1737ba510 100644
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "January 24, 2024"
+.TH PNG 5 "January 29, 2024"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 
diff --git a/png.c b/png.c
index e411381f8..cf9f36107 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_41 Your_png_h_is_not_version_1_6_41;
+typedef png_libpng_version_1_6_42 Your_png_h_is_not_version_1_6_42;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -794,7 +794,7 @@ png_get_copyright(png_const_structrp png_ptr)
    return PNG_STRING_COPYRIGHT
 #else
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.41" PNG_STRING_NEWLINE \
+      "libpng version 1.6.42" PNG_STRING_NEWLINE \
       "Copyright (c) 2018-2024 Cosmin Truta" PNG_STRING_NEWLINE \
       "Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson" \
       PNG_STRING_NEWLINE \
diff --git a/png.h b/png.h
index fefd45662..f537c5bb0 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.41
+ * libpng version 1.6.42
  *
  * Copyright (c) 2018-2024 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
@@ -15,7 +15,7 @@
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
  *   libpng versions 0.97, January 1998, through 1.6.35, July 2018:
  *     Glenn Randers-Pehrson
- *   libpng versions 1.6.36, December 2018, through 1.6.41, January 2024:
+ *   libpng versions 1.6.36, December 2018, through 1.6.42, January 2024:
  *     Cosmin Truta
  *   See also "Contributing Authors", below.
  */
@@ -239,7 +239,7 @@
  *    ...
  *    1.5.30                  15    10530  15.so.15.30[.0]
  *    ...
- *    1.6.41                  16    10641  16.so.16.41[.0]
+ *    1.6.42                  16    10641  16.so.16.41[.0]
  *
  *    Henceforth the source version will match the shared-library major and
  *    minor numbers; the shared-library major version number will be used for
@@ -278,7 +278,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.41"
+#define PNG_LIBPNG_VER_STRING "1.6.42"
 #define PNG_HEADER_VERSION_STRING " libpng version " PNG_LIBPNG_VER_STRING "\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
@@ -318,7 +318,7 @@
  * From version 1.0.1 it is:
  * XXYYZZ, where XX=major, YY=minor, ZZ=release
  */
-#define PNG_LIBPNG_VER 10641 /* 1.6.41 */
+#define PNG_LIBPNG_VER 10641 /* 1.6.42 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -428,7 +428,7 @@ extern "C" {
 /* 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_41;
+typedef char* png_libpng_version_1_6_42;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
diff --git a/pngconf.h b/pngconf.h
index 30c1aad52..99851f4f9 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine-configurable file for libpng
  *
- * libpng version 1.6.41
+ * libpng version 1.6.42
  *
  * Copyright (c) 2018-2024 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
diff --git a/pngtest.c b/pngtest.c
index f83e8bbf2..d96750102 100644
--- a/pngtest.c
+++ b/pngtest.c
@@ -2155,4 +2155,4 @@ main(void)
 #endif
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_41 Your_png_h_is_not_version_1_6_41;
+typedef png_libpng_version_1_6_42 Your_png_h_is_not_version_1_6_42;
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 3cc2ecb71..5fde8aeaf 100644
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.41
+version=1.6.42
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index d206d86a4..2d578b68c 100644
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng16
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.6.41
+Version: 1.6.42
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index d768a8ef0..330453c13 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,6 +1,6 @@
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.6.41 */
+/* libpng version 1.6.42 */
 
 /* Copyright (c) 2018-2024 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */