diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79f997a8b7c..19ec3ee614d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ project (PIO C Fortran)
 # The project version number.
 set(VERSION_MAJOR   2   CACHE STRING "Project major version number.")
 set(VERSION_MINOR   4   CACHE STRING "Project minor version number.")
-set(VERSION_PATCH   2   CACHE STRING "Project patch version number.")
+set(VERSION_PATCH   3   CACHE STRING "Project patch version number.")
 mark_as_advanced(VERSION_MAJOR VERSION_MINOR VERSION_PATCH)
 
 # The size of the data buffer for write/read_darray().
diff --git a/configure.ac b/configure.ac
index 324704ec95b..99b4a7f93db 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,19 +3,19 @@
 
 
 # Initialize autoconf and automake.
-AC_INIT(pio, 2.4.2-development)
+AC_INIT(pio, 2.4.3)
 AC_CONFIG_SRCDIR(src/clib/pio_darray.c)
 AM_INIT_AUTOMAKE([foreign serial-tests])
 
 # The PIO version, again.
 AC_DEFINE([PIO_VERSION_MAJOR], [2], [PIO major version])
 AC_DEFINE([PIO_VERSION_MINOR], [4], [PIO minor version])
-AC_DEFINE([PIO_VERSION_PATCH], [2], [PIO patch version])
+AC_DEFINE([PIO_VERSION_PATCH], [3], [PIO patch version])
 
 # Once more for the documentation.
 AC_SUBST([VERSION_MAJOR], [2])
 AC_SUBST([VERSION_MINOR], [4])
-AC_SUBST([VERSION_PATCH], [2])
+AC_SUBST([VERSION_PATCH], [3])
 
 # The m4 directory holds macros for autoconf.
 AC_CONFIG_MACRO_DIR([m4])
diff --git a/src/clib/Makefile.am b/src/clib/Makefile.am
index a2abefce34f..eba8240a83e 100644
--- a/src/clib/Makefile.am
+++ b/src/clib/Makefile.am
@@ -7,7 +7,7 @@ lib_LTLIBRARIES = libpio.la
 # These linker flags specify libtool version info.
 # See http://www.gnu.org/software/libtool/manual/libtool.html#Libtool-versioning
 # for information regarding incrementing `-version-info`.
-libpio_la_LDFLAGS = -version-info 1:1:0
+libpio_la_LDFLAGS = -version-info 2:0:1
 
 # The header file.
 include_HEADERS = pio.h
diff --git a/src/flib/Makefile.am b/src/flib/Makefile.am
index 9e8f823f55e..8260910e3db 100644
--- a/src/flib/Makefile.am
+++ b/src/flib/Makefile.am
@@ -12,7 +12,7 @@ AM_CPPFLAGS = -D_NETCDF -D_NETCDF4 -D_PETCDF
 # These linker flags specify libtool version info.
 # See http://www.gnu.org/software/libtool/manual/libtool.html#Libtool-versioning
 # for information regarding incrementing `-version-info`.
-libpiof_la_LDFLAGS = -version-info 1:1:0
+libpiof_la_LDFLAGS = -version-info 2:0:1
 
 # The library soure files.
 libpiof_la_LIBADD = libpio_nf.la libpio_kinds.la libpio_support.la	\