diff --git a/ANNOUNCE b/ANNOUNCE
index ecf9c7043..83bf76ebb 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,3 +1,11 @@
+libpng 1.6.38.git
+=================
+
+This is a development version, not intended to be a public release.
+It will be replaced by a public release, or by another development
+version, at a later time.
+
+
 libpng 1.6.37 - April 14, 2019
 ==============================
 
diff --git a/CHANGES b/CHANGES
index f0b0a9342..01deeeff0 100644
--- a/CHANGES
+++ b/CHANGES
@@ -6103,6 +6103,8 @@ Version 1.6.37 [April 14, 2019]
   Added makefiles for AddressSanitizer-enabled builds.
   Cleaned up various makefiles.
 
+Version 1.6.38 [TODO]
+
 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/CMakeLists.txt b/CMakeLists.txt
index 6451fcf1b..471949d0e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 # CMakeLists.txt
 
-# Copyright (C) 2018 Cosmin Truta
-# Copyright (C) 2007,2009-2018 Glenn Randers-Pehrson
+# Copyright (c) 2018-2019 Cosmin Truta
+# Copyright (c) 2007,2009-2018 Glenn Randers-Pehrson
 # Written by Christian Ehrlicher, 2007
 # Revised by Roger Lowman, 2009-2010
 # Revised by Clifford Yapp, 2011-2012,2017
@@ -26,7 +26,7 @@ enable_testing()
 
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 6)
-set(PNGLIB_RELEASE 37)
+set(PNGLIB_RELEASE 38)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})
 
@@ -838,8 +838,8 @@ endif()
 # SET UP LINKS
 if(PNG_SHARED)
   set_target_properties(png PROPERTIES
-#   VERSION 16.${PNGLIB_RELEASE}.1.6.37
-    VERSION 16.${PNGLIB_RELEASE}.0
+    VERSION 16.${PNGLIB_RELEASE}.git
+#   VERSION 16.${PNGLIB_RELEASE}.0
     SOVERSION 16
     CLEAN_DIRECT_OUTPUT 1)
 endif()
diff --git a/README b/README
index cfc1f0e3d..deabb5bfe 100644
--- a/README
+++ b/README
@@ -1,5 +1,5 @@
-README for libpng version 1.6.37 - April 14, 2019
-=================================================
+README for libpng version 1.6.38.git
+====================================
 
 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 b/configure
index 1b2c46366..574bfaeb5 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 1.6.37.
+# Generated by GNU Autoconf 2.69 for libpng 1.6.38.git.
 #
 # 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='1.6.37'
-PACKAGE_STRING='libpng 1.6.37'
+PACKAGE_VERSION='1.6.38.git'
+PACKAGE_STRING='libpng 1.6.38.git'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1372,7 +1372,7 @@ 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 1.6.37 to adapt to many kinds of systems.
+\`configure' configures libpng 1.6.38.git to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1442,7 +1442,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.6.37:";;
+     short | recursive ) echo "Configuration of libpng 1.6.38.git:";;
    esac
   cat <<\_ACEOF
 
@@ -1622,7 +1622,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.6.37
+libpng configure 1.6.38.git
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1954,7 +1954,7 @@ 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 1.6.37, which was
+It was created by libpng $as_me 1.6.38.git, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2825,7 +2825,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.6.37'
+ VERSION='1.6.38.git'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -2946,10 +2946,10 @@ fi
 
 
 
-PNGLIB_VERSION=1.6.37
+PNGLIB_VERSION=1.6.38.git
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
-PNGLIB_RELEASE=37
+PNGLIB_RELEASE=38
 
 
 
@@ -14354,7 +14354,7 @@ 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 1.6.37, which was
+This file was extended by libpng $as_me 1.6.38.git, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -14420,7 +14420,7 @@ _ACEOF
 cat >>$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 1.6.37
+libpng config.status 1.6.38.git
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index 52dba94b4..17a6a2fbe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 # configure.ac
 
-# Copyright (c) 2018 Cosmin Truta
+# Copyright (c) 2018-2019 Cosmin Truta
 # Copyright (c) 2004-2016 Glenn Randers-Pehrson
 
 # This code is released under the libpng license.
@@ -25,7 +25,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.37],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.38.git],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -46,10 +46,10 @@ 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=1.6.37
+PNGLIB_VERSION=1.6.38.git
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
-PNGLIB_RELEASE=37
+PNGLIB_RELEASE=38
 
 dnl End of version number stuff
 
diff --git a/png.c b/png.c
index 757c755f9..e92008d39 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_37 Your_png_h_is_not_version_1_6_37;
+typedef png_libpng_version_1_6_38_git Your_png_h_is_not_version_1_6_38_git;
 
 #ifdef __GNUC__
 /* The version tests may need to be added to, but the problem warning has
@@ -815,7 +815,7 @@ png_get_copyright(png_const_structrp png_ptr)
    return PNG_STRING_COPYRIGHT
 #else
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.37" PNG_STRING_NEWLINE \
+      "libpng version 1.6.38.git" PNG_STRING_NEWLINE \
       "Copyright (c) 2018-2019 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 139eb0dc0..57b9399a6 100644
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.37 - April 14, 2019
+ * libpng version 1.6.38.git
  *
  * Copyright (c) 2018-2019 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
@@ -278,8 +278,8 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.37"
-#define PNG_HEADER_VERSION_STRING " libpng version 1.6.37 - April 14, 2019\n"
+#define PNG_LIBPNG_VER_STRING "1.6.38.git"
+#define PNG_HEADER_VERSION_STRING " libpng version 1.6.38.git\n"
 
 #define PNG_LIBPNG_VER_SONUM   16
 #define PNG_LIBPNG_VER_DLLNUM  16
@@ -287,12 +287,12 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   6
-#define PNG_LIBPNG_VER_RELEASE 37
+#define PNG_LIBPNG_VER_RELEASE 38
 
 /* This should be zero for a public release, or non-zero for a
  * development version.  [Deprecated]
  */
-#define PNG_LIBPNG_VER_BUILD  0
+#define PNG_LIBPNG_VER_BUILD  1
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -309,7 +309,7 @@
 #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.
@@ -318,7 +318,7 @@
  * From version 1.0.1 it is:
  * XXYYZZ, where XX=major, YY=minor, ZZ=release
  */
-#define PNG_LIBPNG_VER 10637 /* 1.6.37 */
+#define PNG_LIBPNG_VER 10638 /* 1.6.38.git */
 
 /* 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_37;
+typedef char* png_libpng_version_1_6_38_git;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *
diff --git a/pngconf.h b/pngconf.h
index 927a769db..8c56d4094 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine-configurable file for libpng
  *
- * libpng version 1.6.37
+ * libpng version 1.6.38.git
  *
  * Copyright (c) 2018-2019 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
diff --git a/pngtest.c b/pngtest.c
index a715ae112..dd5113dbc 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_37 Your_png_h_is_not_version_1_6_37;
+typedef png_libpng_version_1_6_38_git Your_png_h_is_not_version_1_6_38_git;
diff --git a/scripts/libpng-config-head.in b/scripts/libpng-config-head.in
index 2a5afb46a..c1da02cdb 100644
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.37
+version=1.6.38.git
 prefix=""
 libdir=""
 libs=""
diff --git a/scripts/libpng.pc.in b/scripts/libpng.pc.in
index 416fefe86..19afcc325 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: 1.6.37
+Version: 1.6.38.git
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}
diff --git a/scripts/makefile.netbsd b/scripts/makefile.netbsd
index 9a6b04629..5802f3103 100644
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -14,7 +14,7 @@ MANDIR= ${LOCALBASE}/man
 INCSDIR=${LOCALBASE}/include
 
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.37
+SHLIB_MINOR=	1.6.38.git
 
 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
diff --git a/scripts/makefile.openbsd b/scripts/makefile.openbsd
index ad5ffb3a3..b3aec33d1 100644
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat
 
 SHLIB_MAJOR=	16
-SHLIB_MINOR=	1.6.37
+SHLIB_MINOR=	1.6.38.git
 
 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 e1e27e957..8859a0689 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,6 +1,6 @@
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.6.37 */
+/* libpng version 1.6.38.git */
 
 /* Copyright (c) 2018-2019 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */