diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1c75d29c8c..fab856e9fe 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   5   CACHE STRING "Project minor version number.")
-set(VERSION_PATCH   0   CACHE STRING "Project patch version number.")
+set(VERSION_PATCH   1   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 10e6bb464b..60d1f88646 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,19 +2,19 @@
 ## Ed Hartnett 8/16/17
 
 # Initialize autoconf and automake.
-AC_INIT(pio, 2.5.0)
+AC_INIT(pio, 2.5.1)
 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], [5], [PIO minor version])
-AC_DEFINE([PIO_VERSION_PATCH], [0], [PIO patch version])
+AC_DEFINE([PIO_VERSION_PATCH], [1], [PIO patch version])
 
 # Once more for the documentation.
 AC_SUBST([VERSION_MAJOR], [2])
 AC_SUBST([VERSION_MINOR], [5])
-AC_SUBST([VERSION_PATCH], [0])
+AC_SUBST([VERSION_PATCH], [1])
 
 # 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 e08d8a21a4..2f337e6317 100644
--- a/src/clib/Makefile.am
+++ b/src/clib/Makefile.am
@@ -13,7 +13,7 @@ endif # BUILD_NCINT
 # 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`.
-libpioc_la_LDFLAGS = -version-info 4:0:3
+libpioc_la_LDFLAGS = -version-info 4:1:3
 
 # The library header file will be installed in include dir.
 include_HEADERS = pio.h uthash.h
diff --git a/src/flib/Makefile.am b/src/flib/Makefile.am
index 0a7966636f..7862825f28 100644
--- a/src/flib/Makefile.am
+++ b/src/flib/Makefile.am
@@ -12,7 +12,7 @@ AM_CPPFLAGS = -D_NETCDF -D_NETCDF4 -D_PNETCDF
 # 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 3:0:2
+libpiof_la_LDFLAGS = -version-info 3:1:2
 
 # The library soure files.
 libpiof_la_LIBADD = libpio_nf.la libpio_kinds.la libpio_support.la	\