diff --git a/CMakeLists.txt b/CMakeLists.txt
index a14e59e5..18337565 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -745,7 +745,7 @@ else ()
                           COMPILE_DEFINITIONS "DLL_EXPORT"
                           PUBLIC_HEADER "${public_headers}"
                           VERSION ${ZMQ_VERSION}
-                          SOVERSION "5.1.2"
+                          SOVERSION "5.1.3"
                           OUTPUT_NAME "libzmq"
                           PREFIX "")
     if (ZMQ_BUILD_FRAMEWORK)
diff --git a/NEWS b/NEWS
index 55eef6aa..1e04da54 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,6 @@
+0MQ version 4.2.3 stable, released on 20xx/xx/xx
+=============================================
+
 0MQ version 4.2.2 stable, released on 2017/02/18
 =============================================
 
diff --git a/configure.ac b/configure.ac
index 0f19396b..b90b3795 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,9 +40,10 @@ AC_SUBST(PACKAGE_VERSION)
 # ZeroMQ version 4.2.0: 6:0:1 (ABI version 5)
 # ZeroMQ version 4.2.1: 6:1:1 (ABI version 5)
 # ZeroMQ version 4.2.2: 6:2:1 (ABI version 5)
+# ZeroMQ version 4.2.3: 6:3:1 (ABI version 5)
 #
 # libzmq -version-info current:revision:age
-LTVER="6:2:1"
+LTVER="6:3:1"
 AC_SUBST(LTVER)
 
 # Take a copy of original flags
diff --git a/include/zmq.h b/include/zmq.h
index 21a78eb6..bea794e6 100644
--- a/include/zmq.h
+++ b/include/zmq.h
@@ -41,7 +41,7 @@
 /*  Version macros for compile-time API version detection                     */
 #define ZMQ_VERSION_MAJOR 4
 #define ZMQ_VERSION_MINOR 2
-#define ZMQ_VERSION_PATCH 2
+#define ZMQ_VERSION_PATCH 3
 
 #define ZMQ_MAKE_VERSION(major, minor, patch) \
     ((major) * 10000 + (minor) * 100 + (patch))
diff --git a/packaging/debian/changelog b/packaging/debian/changelog
index 0339251c..726e57a2 100644
--- a/packaging/debian/changelog
+++ b/packaging/debian/changelog
@@ -1,4 +1,4 @@
-zeromq (4.2.2) UNRELEASED; urgency=low
+zeromq (4.2.3) UNRELEASED; urgency=low
 
   * Initial packaging.
 
diff --git a/packaging/debian/zeromq.dsc.obs b/packaging/debian/zeromq.dsc.obs
index 1f65670d..a785a1f6 100644
--- a/packaging/debian/zeromq.dsc.obs
+++ b/packaging/debian/zeromq.dsc.obs
@@ -2,7 +2,7 @@ Format: 3.0 (quilt)
 Source: zeromq
 Binary: libzmq5, libzmq3-dev, libzmq5-dbg
 Architecture: any
-Version: 4.2.2
+Version: 4.2.3
 Maintainer: libzmq Developers <zeromq-dev@lists.zeromq.org>
 Homepage: http://www.zeromq.org/
 Standards-Version: 3.9.8
diff --git a/packaging/redhat/zeromq.spec b/packaging/redhat/zeromq.spec
index 536cab55..d09d9118 100644
--- a/packaging/redhat/zeromq.spec
+++ b/packaging/redhat/zeromq.spec
@@ -10,7 +10,7 @@
 %endif
 %define lib_name libzmq5
 Name:          zeromq
-Version:       4.2.2
+Version:       4.2.3
 Release:       1%{?dist}
 Summary:       The ZeroMQ messaging library
 Group:         Applications/Internet